A299171 Primes p such that Ramanujan number tau(p) is divisible by p+1.

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 41, 47, 53, 59, 71, 79, 83, 89, 97, 107, 127, 137, 139, 149, 167, 179, 191, 199, 223, 229, 239, 251, 269, 293, 349, 359, 367, 383, 419, 431, 449, 479, 499, 503, 587, 593, 599, 643, 647, 719, 809, 827, 839, 863, 881, 919

Offset: 1

Author

Seiichi Manyama, Feb 04 2018

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..900

Crossrefs

Cf. A000594, A007659, A299157, A299163, A299172.

Programs

Mathematica

Select[Range[1000], PrimeQ[#] && Divisible[RamanujanTau[#], #+1] &] (* Amiram Eldar, Apr 14 2021 *)

PARI

isok(p) = isprime(p) && !(ramanujantau(p) % (p+1)); \\ Michel Marcus, Feb 05 2018