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A077500 Primes of the form 2^r*p^s + 1, where p is an odd prime. 5
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 37, 41, 47, 53, 59, 73, 83, 89, 97, 101, 107, 109, 113, 137, 149, 163, 167, 173, 179, 193, 197, 227, 233, 251, 257, 263, 269, 293, 317, 347, 353, 359, 383, 389, 401, 433, 449, 467, 479, 487, 503, 509, 557, 563, 569, 577, 587 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Primes p such that p-1 has at most one odd prime divisor.

LINKS

Table of n, a(n) for n=1..57.

MATHEMATICA

Select[Prime[Range[110]], Length[Select[FactorInteger[#-1] [[All, 1]], OddQ]]<2&] (* Harvey P. Dale, Oct 09 2017 *)

CROSSREFS

Cf. A005109, A077497, A077498, A077499.

Sequence in context: A095319 A129621 A316504 * A036955 A040179 A040986

Adjacent sequences:  A077497 A077498 A077499 * A077501 A077502 A077503

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Nov 07 2002

EXTENSIONS

Corrected and extended by Sascha Kurz, Jan 04 2003

STATUS

approved

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Last modified September 17 19:02 EDT 2019. Contains 327137 sequences. (Running on oeis4.)