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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A302987 Primes p such that p+3 divides 3^p+3.

Original entry on oeis.org

3, 7, 727, 1595287, 3773335151, 53968982887, 218662611751, 373627441111, 525882352087, 612618285511
Offset: 1

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Author

Alex Ratushnyak, Apr 17 2018

Keywords

Comments

Conjecture: the sequence is finite.
Is this the same as the primes in A251862? - Michel Marcus, Apr 17 2018
a(11) > 10^12, if it exists. - Giovanni Resta, Apr 17 2018

Crossrefs

Cf. A000040, A000244, A302988.

Programs

  • Mathematica
    Select[Prime[Range[10000]], Divisible[3^# + 3, # + 3] &] (* Vincenzo Librandi, Apr 17 2018 *)
  • PARI
    isok(p) = isprime(p) && (Mod(3,p+3)^p == Mod(-3,p+3)); \\ Michel Marcus, Apr 17 2018

Extensions

a(4)-a(5) from Michel Marcus, Apr 17 2018
a(6)-a(10) from Giovanni Resta, Apr 17 2018
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