cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-10 of 25 results. Next

A108312 Integers n such that 10^n + 27 is prime.

Original entry on oeis.org

1, 2, 83, 167, 242, 14081, 65537
Offset: 1

Views

Author

Julien Peter Benney (jpbenney(AT)ftml.net), Jun 29 2005

Keywords

Comments

The next term, if one exists, is >100000. - Robert Price, May 24 2010
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "10027".

Examples

			For n=2 we have 10^2 + 27 = 100 + 27 = 127, which is prime.

Links

Crossrefs

Cf. A049054, A088274, A088275, A095688, A107083, A108049, A108050, A108052, A108054.

Programs

  • Mathematica
    Do[ If[ PrimeQ[10^n + 27], Print[n]], {n, 3000}] (* Robert G. Wilson v, Jul 01 2005 *)

Extensions

a(6)=14081 from Robert Price, Mar 22 2010
Edited by Ray Chandler, Dec 23 2010
a(7)=65537 from Robert Price, Jan 29 2011

A110980 Integers n such that 10^n+99 is prime.

Original entry on oeis.org

1, 2, 4, 6, 13, 14, 16, 17, 19, 30, 31, 60, 68, 73, 113, 144, 276, 288, 364, 449, 473, 739, 833, 1171, 1732, 2292, 3912, 7673, 9458, 16982, 19751, 21479, 23837, 77726
Offset: 1

Views

Author

Julien Peter Benney (jpbenney(AT)ftml.net), Sep 30 2005

Keywords

Comments

The next term, if one exists, is >100000. - Robert Price, Apr 25 2011
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "10w99".

Examples

			If n=6, we have 10^6+99 = 1000000+99 = 1000099, which is prime.

Links

Crossrefs

Cf. A049054, A088274, A088275, A095688, A107083, A108049, A108050, A108052, A108054.

Programs

  • Magma
    [n: n in [1..400]| IsPrime(10^n+99)]; // Vincenzo Librandi, Nov 02 2014
  • Mathematica
    Select[Range[78000],PrimeQ[10^#+99]&] (* Harvey P. Dale, Aug 23 2013 *)

Extensions

a(1)=1 added by Vladimir Joseph Stephan Orlovsky, May 02 2008
a(29)-a(33) from Robert Price, Mar 22 2010
a(34)=77726 from Robert Price, Mar 03 2011

A110918 Integers n such that 10^n+91 is a prime number.

Original entry on oeis.org

1, 2, 3, 4, 11, 12, 15, 19, 136, 144, 732, 5754, 6602, 23499, 39583, 74254, 93356, 94016
Offset: 1

Views

Author

Julien Peter Benney (jpbenney(AT)ftml.net), Oct 04 2005

Keywords

Comments

No additional terms < 100000.
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "10091".

Examples

			n = 4 is a member: 10^4+91 = 10000+91 = 10091, which is prime.

Links

Crossrefs

Cf. A049054, A088274, A088275, A095688, A107083, A108049, A108050, A108052, A108054.

Programs

Extensions

a(1)=1 added by Vladimir Joseph Stephan Orlovsky, May 02 2008
a(12)-a(15) from Robert Price, Dec 12 2010
Edited by Ray Chandler, Dec 23 2010
a(16)=74254 from Robert Price, Mar 03 2011
a(17)=92178 and a(18)=94016 from Robert Price, Apr 19 2011
a(17)=93356 corrected by Robert Price, Apr 19 2011
a(12) corrected by Tyler Busby, May 03 2024

A111021 Integers k such that 7*10^k + 31 is a prime number.

Original entry on oeis.org

1, 8, 11, 143, 203, 2727, 2911, 3339, 17039
Offset: 1

Views

Author

Julien Peter Benney (jpbenney(AT)ftml.net), Oct 04 2005

Keywords

Comments

See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "70031".
a(10) > 10^5. - Robert Price, Jan 28 2017

Examples

			k = 11 is a term because 7*10^11 + 31 = 7*100000000000 + 31 = 700000000000 + 31 = 700000000031, which is a prime.

Links

Crossrefs

Cf. A049054, A088274, A088275, A095688, A107083, A108049, A108050, A108052, A108054, A110980.

Programs

  • Magma
    [n: n in [1..300] | IsPrime(7*10^n+31)]; // Vincenzo Librandi, Jul 03 2016
  • Mathematica
    Select[Range[0, 10000], PrimeQ[7 10^# + 31] &] (* Vincenzo Librandi, Jul 03 2016 *)

Extensions

a(9) from Ray Chandler, Dec 23 2010
a(1) = 1 prepended by Vincenzo Librandi, Jul 03 2016

A135107 Integers n such that 10^n+97 is prime.

Original entry on oeis.org

1, 2, 3, 9, 10, 14, 19, 67, 94, 201, 241, 589, 934, 1151, 1179, 4957, 6329, 13621, 26425
Offset: 1

Views

Author

Julien Peter Benney (jpbenney(AT)gmail.com), Feb 12 2008

Keywords

Comments

The next term, if one exists, is >100000. - Robert Price, Apr 25 2011
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "10097".

Examples

			n = 3 is a member because 10^3+97 = 1000+97 = 1097, which is prime.

Links

Crossrefs

Cf. A095688, A108052, A108050, A108312, A107083, A108049, A108054.

Programs

Extensions

a(14)-a(19) from Robert Price, Nov 06 2010
Edited by Ray Chandler, Dec 23 2010

A135108 Integers n such that 10^n+39 is a prime number.

Original entry on oeis.org

2, 3, 4, 6, 8, 12, 20, 72, 196, 676, 1528, 1923, 5244, 5379, 6308, 21222, 81778
Offset: 1

Views

Author

Julien Peter Benney (jpbenney(AT)gmail.com), Feb 12 2008

Keywords

Examples

			6 is a member: 10^6+39 = 1000000+39 = 1000039, which is a prime number.

Links

Crossrefs

Cf. A095688, A108052, A108050, A108312, A107083, A108049, A108054.

Programs

  • Magma
    [n: n in [0..500] |IsPrime(10^n+39)]; // Vincenzo Librandi, Sep 24 2016
  • Mathematica
    Select[Range[2000], PrimeQ[10^# + 39] &] (* G. C. Greubel, Sep 23 2016 *)

Extensions

a(11)-a(12) from Harvey P. Dale, May 25 2008
a(13)-a(16) from Robert Price, Jan 30 2010
Edited by Ray Chandler, Dec 23 2010
a(17) from Robert Price, Mar 03 2011

A135109 Integers n such that 10^n+37 is a prime number.

Original entry on oeis.org

1, 2, 4, 6, 8, 13, 15, 39, 169, 184, 228, 255, 279, 632, 2230, 2238, 2606, 3286, 4604, 4958, 4964, 6016, 8726, 9813, 16201, 16878, 26989, 55372, 72631
Offset: 1

Views

Author

Julien Peter Benney (jpbenney(AT)gmail.com), Feb 12 2008

Keywords

Comments

Verified existing terms. The next term, if one exists, is >39456. - Robert Price, May 24 2010
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "10037".

Examples

			6 is a member because 10^6+37 = 1000000+37 = 1000037, which is prime.

Links

Crossrefs

Cf. A095688, A108052, A108050, A108312, A107083, A108049, A108054.

Programs

Extensions

Missing initial term 1 added by Vladimir Joseph Stephan Orlovsky, May 06 2008
16201, 16878 added by Robert Price, Mar 22 2010
Additional terms 2230, 2238, 2606, 3286, 4604, 4958, 4964, 6016, 8726, 9813, 26989 from Robert Price, May 24 2010
Edited by Ray Chandler, Dec 23 2010
a(28)=55372 from Robert Price, Jan 09 2011
a(29)=72631 from Robert Price, Jan 29 2011

A135112 Integers n such that 10^n+93 is a prime number.

Original entry on oeis.org

1, 2, 3, 4, 9, 61, 78, 116, 632, 1184, 2034, 3870, 3914, 6456, 12464, 58250
Offset: 1

Views

Author

Julien Peter Benney (jpbenney(AT)gmail.com), Feb 12 2008

Keywords

Comments

The next term, if one exists, is >100000. - Robert Price, Apr 25 2011
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "10093".

Examples

			4 is a member: 10^4+93 = 10000+93 = 10093, which is a prime number.

Links

Crossrefs

Cf. A095688, A108052, A108050, A108312, A107083, A108049, A108054.

Programs

Extensions

a(1)=1 added by Vladimir Joseph Stephan Orlovsky, May 02 2008
a(4) corrected by Vladimir Joseph Stephan Orlovsky, May 02 2008
a(10)-a(15) by Robert Price, Dec 12 2010
Edited by Ray Chandler, Dec 23 2010
a(16)=58250 from Robert Price, Jan 29 2011

A135113 Integers k such that 10^k + 67 is a prime number.

Original entry on oeis.org

2, 4, 14, 26, 36, 60, 150, 410, 484, 972, 1942, 3694, 6926, 8582, 11930, 16076, 16276, 22820
Offset: 1

Views

Author

Julien Peter Benney (jpbenney(AT)gmail.com), Feb 12 2008

Keywords

Comments

The next k, if it exists, is > 100000. - Robert Price, Apr 25 2011
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "10067".

Examples

			4 is a term: 10^4 + 67 = 10000 + 67 = 10067, which is a prime number.

Links

Crossrefs

Cf. A095688, A108052, A108050, A108312, A107083, A108049, A108054.

Extensions

Term 11930 from Robert Price, Mar 22 2010
Terms 1942, 3694, 6926, 8582, 16076, 16276, 22820 from Robert Price, Sep 04 2010
Edited by Ray Chandler, Dec 23 2010

A135114 Integers k such that 10^k + 69 is a prime number.

Original entry on oeis.org

1, 3, 4, 5, 10, 11, 16, 35, 49, 69, 119, 223, 400, 775, 1003, 1523, 2225, 6793, 7018, 13600, 76801
Offset: 1

Views

Author

Julien Peter Benney (jpbenney(AT)gmail.com), Feb 12 2008

Keywords

Comments

Next term in sequence, if one exists is > 100000. - Robert Price, Apr 25 2011
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "10069".

Examples

			5 is a term because 10^5 + 69 = 100000 + 69 = 100069, which is prime.

Links

Crossrefs

Cf. A095688, A108052, A108050, A108312, A107083, A108049, A108054.

Extensions

Term 13600 from Robert Price, Mar 22 2010
Terms 1003, 1523, 2225, 6793, 7018 inserted by Robert Price, Oct 31 2010
Edited by Ray Chandler, Dec 23 2010
a(21)=76801 from Robert Price, Mar 03 2011
Showing 1-10 of 25 results. Next

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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