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 1-3 of 3 results.

A062585 Numbers k such that 19^k - 18^k is prime.

Original entry on oeis.org

2, 1607, 1873, 10957
Offset: 1

Views

Author

Mike Oakes, May 18 2001, May 19 2001

Keywords

Comments

PrimePi[ a(n) ] = {2, 253, 287, 1331, ...}. - Alexander Adamchuk, Feb 16 2007
a(5) > 10^5. - Robert Price, Jun 05 2012
Terms greater than 1000 may correspond to (unproven) strong pseudoprimes. - M. F. Hasler, Sep 16 2013

Crossrefs

Cf. A000043, A057468, A059801, A059802, A062572-A062583, A188051, A062586-A062666.

Programs

Extensions

10957 (found by Mike Oakes in 2003) from Alexander Adamchuk, Feb 16 2007

A188051 Numbers k such that 18^k - 17^k is prime, or a strong pseudoprime.

Original entry on oeis.org

3, 13, 71, 14533, 26641, 48179
Offset: 1

Views

Author

Jean-Louis Charton, Mar 19 2011

Keywords

Comments

Terms < 10000 found by Mike Oakes.
Term 14533 found by Lelio R Paula in June 2008 corresponding to a probable prime with 18243 digits.
Terms 26641 and 48179 found by Jean-Louis Charton in December 2010 corresponding to probable primes with 33442 and 60478 digits.
a(7) > 10^5. - Robert Price, Nov 30 2012

Links

Crossrefs

Cf. A000043, A057468, A059801, A059802, A059803, A062572-A062583, A062585-A062666.

Programs

Extensions

Edited by M. F. Hasler, Sep 21 2013

A219284 Primes of the form 17^n - 16^n.

Original entry on oeis.org

371281, 141903217
Offset: 1

Views

Author

Vincenzo Librandi, Nov 24 2012

Keywords

Comments

a(3) has 98 digits and a(6) has 3491 digits.

Links

Crossrefs

Cf. A062583.

Programs

  • Magma
    [a: n in [0..30] | IsPrime(a) where a is 17^n - 16^n];
  • Mathematica
    Select[Table[17^n - 16^n, {n, 0, 300}], PrimeQ]
Showing 1-3 of 3 results.

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

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