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A156543 Multiplicative closure of primes that are not Sophie Germain primes (A053176). 7
1, 7, 13, 17, 19, 31, 37, 43, 47, 49, 59, 61, 67, 71, 73, 79, 91, 97, 101, 103, 107, 109, 119, 127, 133, 137, 139, 149, 151, 157, 163, 167, 169, 181, 193, 197, 199, 211, 217, 221, 223, 227, 229, 241, 247, 257, 259, 263, 269, 271, 277, 283, 289, 301, 307, 311 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) mod 6 = 1 or = 5; subsequence of A007310;

A156542(a(n)) = 0;

A045979 is a subsequence.

LINKS

R. Zumkeller, Table of n, a(n) for n = 1..1000

CROSSREFS

Cf. A156541.

Sequence in context: A237609 A038906 A097959 * A090863 A045979 A079699

Adjacent sequences:  A156540 A156541 A156542 * A156544 A156545 A156546

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Feb 09 2009

STATUS

approved

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Last modified April 19 04:19 EDT 2019. Contains 322237 sequences. (Running on oeis4.)