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.

Previous Showing 21-25 of 25 results.

A110949 Integers n such that 4*10^n + 61 is prime.

Original entry on oeis.org

1, 2, 7, 11, 191, 248, 1067, 2666, 5252, 13400, 22886, 23739, 29095
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 "40061".
a(14) > 10^5. - Robert Price, Jan 22 2017

Examples

			n = 7 is in the sequence because 4*10^7 + 61 = 4*10000000 + 61 = 40000000 + 61 = 40000061, which is prime.

Links

Crossrefs

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

Programs

  • PARI
    isok(n) = isprime(4*10^n+61); \\ Michel Marcus, Jan 22 2017

Extensions

a(9)-a(11) from Ray Chandler, Dec 23 2010
Prepended a(1)=1 by Robert Price, Jan 22 2017
a(12)-a(13) from Robert Price, Jan 22 2017

A110983 Integers k such that 5*10^k + 51 is prime.

Original entry on oeis.org

1, 3, 4, 16, 430, 727, 1415, 2691, 3160, 3904, 5464, 19875, 65255, 68524
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 "50051".
a(15) > 10^5. - Robert Price, Jan 28 2017

Examples

			k = 4 is a member because: 5*10^4+51 = 5*10000+51 = 50000+51 = 50051, which is prime.

Links

Crossrefs

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

Programs

  • Mathematica
    Select[Range[1, 1000], PrimeQ[5*10^# + 51] &] (* Julien Kluge, Dec 15 2016 *)

Extensions

a(11)-a(12) from Ray Chandler, Dec 23 2010
Prepended a(1)=1 by Robert Price, Jan 28 2017
a(13)-a(14) from Robert Price, Jan 28 2017

A110995 Integers k such that 6*10^k + 41 is a prime number.

Original entry on oeis.org

0, 1, 2, 4, 6, 8, 50, 54, 102, 134, 212, 872, 3055, 3427, 3528, 4262, 4414, 6084, 93792
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 "60041".
a(20) > 10^5. - Robert Price, Jan 19 2017

Examples

			k = 4 is a term because 6*10^4 + 41 = 6*10000 + 41 = 60000 + 41 = 60041, which is a prime number.

Links

Crossrefs

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

Extensions

a(18) from Ray Chandler, Dec 23 2010
a(1)-a(2) prepended by Robert Price, Jan 19 2017
a(19) from Robert Price, Jan 19 2017

A111022 Integers n such that 8*10^n+21 is prime.

Original entry on oeis.org

0, 1, 2, 4, 10, 40, 55, 162, 264, 506, 870, 948, 1339, 3587, 6428, 48490, 81487
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 "80021".
a(18) > 10^5. - Robert Price, Feb 06 2017

Examples

			n = 4 is a member because: 8*10^4+21 = 8*10000+21 = 80000+21 = 80021, which is prime.

Links

Crossrefs

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

Extensions

a(15) from Ray Chandler, Dec 23 2010
Prepended a(1)=0 and a(2)=1 by Robert Price, Feb 06 2017
a(16)-a(17) from Robert Price, Feb 06 2017

A111023 Integers n such that 9*10^n + 11 is a prime number.

Original entry on oeis.org

1, 2, 3, 4, 6, 8, 16, 20, 27, 115, 180, 274, 576, 1111, 2404, 5127, 8082, 9514, 12808, 14752, 15926, 22670, 37432, 41988, 53707, 72595, 92742
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 "90w11".
a(28) > 10^5. - Robert Price, Jan 28 2017

Examples

			n = 6 is a member because 9*10^6 + 11 = 9*1000000 + 11 = 9000011, which is prime.

Links

Crossrefs

Cf. A100275 = numbers n such that 9*10^n-11 is prime.
Cf. A049054, A088274, A088275, A095688, A107083, A108049, A108050, A108052, A108054, A110980.

Programs

  • Mathematica
    Do[If[PrimeQ[9*10^n+11],Print[n]],{n,1,1300}] (* Zak Seidov, Sep 14 2006 *)

Extensions

Edited by N. J. A. Sloane, Apr 11 2008
a(16)-a(22) from Ray Chandler, Dec 23 2010
a(23)-a(27) from Robert Price, Jan 28 2017
Previous Showing 21-25 of 25 results.

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

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