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A249505 Primes p such that p+1 is a totient (i.e., in A000010). 1
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

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

PROG

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

CROSSREFS

Cf. A000010, A078892.

Sequence in context: A144574 A082373 A116959 * A091305 A164319 A085498

Adjacent sequences:  A249502 A249503 A249504 * A249506 A249507 A249508

KEYWORD

nonn

AUTHOR

Joerg Arndt, Oct 30 2014

STATUS

approved

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Last modified September 17 06:41 EDT 2019. Contains 327119 sequences. (Running on oeis4.)