A249505 Primes p such that p+1 is a totient (i.e., in A000010).

3, 5, 7, 11, 17, 19, 23, 29, 31, 41, 43, 47, 53, 59, 71, 79, 83, 101, 103, 107, 109, 127, 131, 137, 139, 149, 163, 167, 179, 191, 197, 199, 211, 223, 227, 239, 251, 263, 269, 271, 281, 293, 311, 331, 347, 359, 367, 379, 383, 419, 431, 439, 443, 461, 463, 467, 479, 491, 499, 503

Offset: 1

Author

Joerg Arndt, Oct 30 2014

Keywords

• nonn

Comments

Primes of the form phi(m) - 1 for some m. A001359 is a subsequence. - Thomas Ordowski, Aug 10 2017

Links

• Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A000010, A078892.

Programs

PARI

select(p->istotient(p+1), primes(200))