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A051646 Primes of the form 30*p + 1 where p is also prime. 1
61, 151, 211, 331, 571, 691, 1231, 1291, 1831, 2011, 2131, 2371, 2671, 3271, 3391, 3931, 4111, 5011, 5431, 5791, 6691, 6871, 6991, 8311, 8431, 9391, 9511, 9931, 10111, 10771, 11491, 13171, 13291, 13711, 13831, 14011, 14731, 15091, 15271 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Analogous to A005385, safe primes. Can be called 30-safe primes.

LINKS

Table of n, a(n) for n=1..39.

EXAMPLE

61 is in the sequence because both 2 and 30*2 + 1 = 61 are primes.

CROSSREFS

Cf. A005384, A005385, A007693.

Sequence in context: A044693 A185662 A140726 * A142320 A171434 A305172

Adjacent sequences:  A051643 A051644 A051645 * A051647 A051648 A051649

KEYWORD

nonn

AUTHOR

Labos Elemer

STATUS

approved

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Last modified November 21 22:40 EST 2019. Contains 329383 sequences. (Running on oeis4.)