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 A214287 Primes of the form phi(n)-1 sorted by increasing n, where phi is the Euler totient function. 2
 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 (list; graph; refs; listen; history; text; internal format)
 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

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Last modified January 23 01:15 EST 2020. Contains 331166 sequences. (Running on oeis4.)