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 12 results. Next

A108311 Duplicate of A092767.

Original entry on oeis.org

2, 5, 8, 12, 15, 18, 20, 30, 80, 143, 152, 164, 176, 239, 291, 324, 504, 594, 983, 2894
Offset: 1

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Author

Keywords

A108328 Integers n such that 10^n - 23 is a prime number.

Original entry on oeis.org

3, 11, 17, 23, 35, 161, 765, 3473, 6887, 27681, 34313
Offset: 1

Views

Author

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

Keywords

Comments

No additional terms < 40000. - Robert Price, Dec 13 2010
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "99977".
No other terms < 100,000. - Robert Price, Mar 03 2011

Examples

			n = 3 is a member because 10^3 - 23 = 1000 - 23 = 977, which is prime.

Links

Crossrefs

Cf. A089675, A095714, A092767.

Programs

Extensions

a(9)-a(11) from Robert Price, Dec 13 2010
Edited by Ray Chandler, Dec 23 2010

A108330 Integers k such that 10^k - 29 is a prime number.

Original entry on oeis.org

2, 3, 5, 7, 8, 13, 14, 761, 794, 2216, 3710, 3860, 3937, 5091, 7754, 29091
Offset: 1

Views

Author

Julien Peter Benney (jpbenney(AT)ftml.net), Jun 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 "99971".

Examples

			k = 8 is a term because 10^8 - 29 = 100000000 - 29 = 99999971, which is prime.

Links

Crossrefs

Cf. A089675, A095714, A092767.

Extensions

a(14)-a(15) from Sean A. Irvine, Mar 04 2010
a(16) from Robert Price, Dec 15 2010
Edited by Ray Chandler, Dec 23 2010

A108506 Integers n such that 10^n-59 is prime.

Original entry on oeis.org

2, 3, 4, 8, 20, 38, 95, 248, 263, 303, 304, 410, 438, 548, 688, 1074, 1575, 8364, 9910, 15910, 37344
Offset: 1

Views

Author

Julien Peter Benney (jpbenney(AT)ftml.net), Jul 06 2005

Keywords

Comments

Certified primality of numbers corresponding to terms 410, 438, 548, 688, 1074 and 1575 with Primo. - Ryan Propper, Jul 08 2005
No other terms <40000.
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "99941".

Examples

			8 is a member because: n = 8 gives 10^8-59 = 100000000-59 = 99999941, which is prime.

Links

Crossrefs

Cf. A089675, A095714, A092767, A108327, A108328, A108329, A108330, A108331, A108332, A177418.

Extensions

a(18)-a(20) from Kamada data by Robert Price, Dec 10 2010
a(21) by Robert Price, Dec 16 2010
Edited by Ray Chandler, Dec 23 2010

A100275 Numbers k such that 9*10^k - 11 is prime.

Original entry on oeis.org

1, 4, 16, 22, 316, 393, 461, 864, 1306, 2964, 8956, 10449, 11652, 13588, 23070, 48421
Offset: 1

Views

Author

R. K. Guy, Dec 29 2004

Keywords

Comments

Numbers corresponding to terms <= 864 are certified primes. - Klaus Brockhaus, Feb 15 2005

Crossrefs

Cf. A092767.

Programs

Extensions

More terms from Patrick De Geest, Dec 29 2004
a(1) = 1 inserted by Tom Mueller, Feb 08 2005
Edited by R. J. Mathar, Aug 06 2008
a(14)-a(15) from Michael S. Branicky, May 01 2023
a(16) from Michael S. Branicky, Sep 11 2024

A108327 Integers n such that 10^n-21 is a prime number.

Original entry on oeis.org

2, 6, 32, 108, 408, 1286, 2268, 2328, 4284, 53558, 181182, 249010
Offset: 1

Views

Author

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

Keywords

Comments

a(13) > 2.5*10^5. - Robert Price, Apr 12 2015

Examples

			6 is a member because 10^6-21 = 1000000-21 = 999979, which is prime.

Links

Crossrefs

Cf. A089675, A095714, A092767.

Extensions

Edited by Ray Chandler, Dec 23 2010
a(10)=53558 from Robert Price, Mar 03 2011
a(11)-a(12) from Kamada data by Robert Price, Apr 12 2015

A108329 Integers k such that 10^k - 27 is prime.

Original entry on oeis.org

2, 4, 7, 14, 20, 22, 29, 31, 40, 80, 85, 224, 767, 952, 3592, 4016, 4187, 9239, 17684, 20716, 30791
Offset: 1

Views

Author

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

Keywords

Comments

See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "99973".
The next term, if one exists, is > 100000. - Robert Price, Apr 25 2011

Examples

			k = 7 is a term because 10^7 - 27 = 10000000 - 27 = 9999973, which is prime.

Links

Crossrefs

Cf. A089675, A095714, A092767, A176987.

Extensions

a(18)-a(19) from Kamada data by Robert Price, Dec 10 2010
a(20)-a(21) from Robert Price, Dec 15 2010
Edited by Ray Chandler, Dec 23 2010

A108331 Integers k such that 10^k - 87 is prime.

Original entry on oeis.org

2, 1800, 2368, 15328
Offset: 1

Views

Author

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

Keywords

Comments

See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "99913".
a(5) > 10^5. - Tyler NeSmith, Jul 26 2021

Examples

			k = 2 is a term because 10^2 - 87 = 100 - 87 = 13, which is prime.

Links

Crossrefs

Cf. A089675, A095714, A092767.

Extensions

a(4) from Kamada data by Robert Price, Dec 13 2010
Edited by Ray Chandler, Dec 23 2010

A108332 Integers k such that 10^k - 89 is prime.

Original entry on oeis.org

2, 3, 637, 2349, 29455, 175093
Offset: 1

Views

Author

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

Keywords

Comments

637 corresponds to a certified prime (Primo 2.2.0 beta). - Ryan Propper, Nov 06 2005
No additional terms < 40000.
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "9w11".

Examples

			k = 3 is a term because 10^3 - 89 = 1000 - 89 = 911, which is prime.

Links

Crossrefs

Cf. A089675, A095714, A092767.

Programs

  • Mathematica
    Do[If[PrimeQ[10^n - 89], Print[n]], {n, 2, 10^4}] (* Ryan Propper, Nov 06 2005 *)

Extensions

a(5) from Robert Price, Dec 15 2010
Edited by Ray Chandler, Dec 23 2010
a(6) from Riley Fisher, Oct 09 2023

A108493 Integers n such that 10^n-57 is prime.

Original entry on oeis.org

2, 7, 10, 11, 17, 19, 39, 49, 50, 61, 95, 106, 187, 196, 849, 889, 6436, 7370, 14446, 19647, 34399, 39922, 81297, 84305
Offset: 1

Views

Author

Julien Peter Benney (jpbenney(AT)ftml.net), Jul 06 2005

Keywords

Comments

Numbers corresponding to terms 849 and 889 are certified primes. (Primo 2.2.0 beta) - Ryan Propper, Jul 13 2005
No additional terms <100000.
See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "99943".

Examples

			n = 7 is a member because: 10^7-57 = 10000000-57 = 9999943, which is prime.

Links

Crossrefs

Cf. A089675, A095714, A092767, A108327, A108328, A108329, A108330, A108331, A108332, A177417.

Extensions

a(17)-a(19) from Kamada data by Robert Price, Dec 10 2010
a(20) from Kamada data by Robert Price, Dec 14 2010
a(21)-a(22) from Robert Price, Dec 15 2010
Edited by Ray Chandler, Dec 23 2010
a(23-24)=81297,84305 from Robert Price, May 29 2011
Showing 1-10 of 12 results. Next

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