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 1-2 of 2 results.

A062652 Numbers k such that 86^k - 85^k is prime.

Original entry on oeis.org

5, 11, 103, 227, 1637, 9677, 41597
Offset: 1

Views

Author

Mike Oakes, May 18 2001, May 19 2001

Keywords

Comments

Terms greater than 1000 are often only strong pseudoprimes.
All terms are prime. - Robert Price, Apr 14 2014
a(8) > 10^5. - Robert Price, Apr 14 2015

Crossrefs

Cf. A000043, A057468, A059801, A059802, A062572-A062666, A215536 (primes 87^n - 86^n).

Programs

  • Mathematica
    Select[Range[0, 300], If[PrimeQ[#], PrimeQ[86^# - 85^#]] &] (* Robert Price, Apr 14 2015 *)
  • PARI
    is(n)=ispseudoprime(86^n-85^n) \\ Charles R Greathouse IV, Jun 12 2017

Extensions

a(7) from Robert Price (computer run by Adam Marciniec), Apr 14 2015

A062654 Numbers k such that 88^k - 87^k is prime or a strong pseudoprime.

Original entry on oeis.org

5, 7, 19, 241, 607, 74047
Offset: 1

Views

Author

Mike Oakes, May 18 2001, May 19 2001

Keywords

Comments

All terms must be prime. - M. F. Hasler, Sep 21 2013
a(7) > 10^5. - Robert Price, May 28 2015

Crossrefs

Cf. A000043, A057468, A059801, A059802, A059803, A062572-A062652, A215536, A062655-A062666.

Programs

Extensions

Edited by M. F. Hasler, Sep 21 2013
a(6) from Robert Price, May 28 2015 (computer run by Adam Marciniec)
Showing 1-2 of 2 results.

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

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