A158021 - OEIS

A158021

Primes such that p, 10*p-1 and (p-1)/2 are all prime.

11, 23, 83, 107, 167, 179, 227, 347, 479, 587, 839, 863, 983, 1283, 1367, 1439, 1487, 1619, 1823, 1907, 2027, 2039, 2447, 2879, 2963, 2999, 3119, 3203, 3623, 3863, 4127, 4139, 4259, 4283, 4787, 5099, 5483, 5879, 6719, 6779, 6983, 7247, 7703, 7727, 7823

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..45.

MATHEMATICA

Flatten[Table[If[PrimeQ[n] && PrimeQ[10*n - 1] && PrimeQ[( n - 1)/2], n, {}], {n, 1, 10000}]]

CROSSREFS

A059455

Sequence in context: A184394 A060160 A241973 * A239638 A050767 A145918

Adjacent sequences: A158018 A158019 A158020 * A158022 A158023 A158024

KEYWORD

nonn

AUTHOR

Roger L. Bagula and Gary W. Adamson, Mar 11 2009

STATUS

approved