A214287 Primes of the form phi(n)-1 sorted by increasing n, where phi is the Euler totient function.

3, 5, 3, 5, 3, 3, 11, 5, 7, 7, 5, 17, 7, 11, 7, 19, 11, 17, 11, 7, 29, 19, 23, 11, 17, 23, 11, 41, 19, 23, 41, 19, 31, 23, 17, 23, 59, 29, 31, 47, 19, 31, 43, 23, 23, 71, 59, 23, 31, 53, 23, 41, 23, 71, 43, 59, 71, 31, 41, 59, 31, 101, 47, 47, 107, 71, 47, 71, 31, 109, 59, 79, 59, 83

Offset

1,1

Comments

Primes in A109606.

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Mathematica

Select[Table[EulerPhi[n]-1, {n, 1, 1000}], PrimeQ]

Crossrefs

Cf. A000010, A078892 (associated n), A214288.

Sequence in context: A175999 A236965 A259684 * A010703 A107489 A152050

Adjacent sequences: A214284 A214285 A214286 * A214288 A214289 A214290

Keyword

nonn,easy

Author

Vincenzo Librandi, Jul 13 2012

Status

approved