A156153 Primes p such that p == 2 (mod pi(p)) and pi(p) is prime.

5, 41, 367, 9559817, 514275529

Offset: 1

Author

M. F. Hasler, Feb 04 2009

Keywords

• nonn
• hard
• more

Crossrefs

Cf. A023144, A156152, A156154, A156155.

Programs

PARI

p=c=0; until(0, until( isprime(c++), p=nextprime(p+1)); (p-2)%c & next; print1(p, ", ")); \\ Modified by Jinyuan Wang, Feb 22 2020

Formula

a(n) = A000040(A156154(n)) = A000040(A000040(A156155(n))).