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A275770 Primes p == 5 (mod 6) that are not Sophie Germain primes. 1
17, 47, 59, 71, 101, 107, 137, 149, 167, 197, 227, 257, 263, 269, 311, 317, 347, 353, 383, 389, 401, 449, 461, 467, 479, 503, 521, 557, 563, 569, 587, 599, 617, 647, 677, 701, 773, 797, 821, 827, 839, 857, 863, 881, 887, 929, 941, 947, 971, 977, 983, 1061, 1091, 1097 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..54.

FORMULA

Subset of A156543 and subset of A045979

Intersection of A007528 and A053176. - Felix Fröhlich, Aug 08 2016

MATHEMATICA

Select[Prime[Range[150]], Mod[#, 6] == 5 && \[Not] PrimeQ[2 # + 1] &]

PROG

(PARI) forprime(p=1, 900, if(Mod(p, 6)==5 && !ispseudoprime(2*p+1), print1(p, ", "))) \\ Felix Fröhlich, Aug 08 2016

CROSSREFS

Cf. A005384, A007528, A045979, A053176, A156543.

Sequence in context: A058205 A329951 A034783 * A126912 A051616 A061275

Adjacent sequences:  A275767 A275768 A275769 * A275771 A275772 A275773

KEYWORD

nonn

AUTHOR

Hilko Koning, Aug 08 2016

STATUS

approved

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Last modified September 25 20:01 EDT 2021. Contains 347659 sequences. (Running on oeis4.)