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.

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A241921 Numbers k such that (15^k - 4^k)/11 is prime.

Original entry on oeis.org

2, 1097, 2243, 2857, 4357, 6803, 20747, 24571
Offset: 1

Views

Author

Robert Price, May 01 2014

Keywords

Comments

All terms are prime.
a(9) > 10^5.
a(1) is trivially prime, the remainder are probable primes.

Crossrefs

Cf. A004063, A028491, A057468, A059801, A121877, A128024, A128025, A128026, A128027, A128028, A128029, A128030, A128031, A128032, A210506, A128347, A225955, A062581.

Programs

  • Mathematica
    Select[Prime[Range[1, 100000]], PrimeQ[(15^# - 4^#)/11]&]
  • PARI
    is(n)=ispseudoprime((15^n-4^n)/11) \\ Charles R Greathouse IV, Jun 13 2017
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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