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A214288 Primes of the form phi(n)+1 sorted by increasing n, where phi is the Euler totient function. 4
2, 2, 3, 3, 5, 3, 7, 5, 7, 5, 11, 5, 13, 7, 17, 7, 19, 13, 11, 23, 13, 19, 13, 29, 31, 17, 17, 13, 37, 19, 17, 41, 13, 43, 23, 47, 17, 43, 53, 19, 41, 37, 29, 59, 17, 61, 31, 37, 67, 71, 73, 37, 41, 37, 61, 79, 41, 83, 43, 41, 89, 73, 61, 47, 73, 97, 43, 61, 41, 101, 103, 53, 107, 37 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Primes in A039649.

All primes are in the sequence.

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, A039698 (associated n), A214287.

Sequence in context: A069974 A039650 A039649 * A253554 A252463 A113605

Adjacent sequences:  A214285 A214286 A214287 * A214289 A214290 A214291

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Jul 13 2012

STATUS

approved

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Last modified November 17 08:39 EST 2019. Contains 329217 sequences. (Running on oeis4.)