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A158021 Primes such that p, 10*p-1 and (p-1)/2 are all prime. 0

%I

%S 11,23,83,107,167,179,227,347,479,587,839,863,983,1283,1367,1439,1487,

%T 1619,1823,1907,2027,2039,2447,2879,2963,2999,3119,3203,3623,3863,

%U 4127,4139,4259,4283,4787,5099,5483,5879,6719,6779,6983,7247,7703,7727,7823

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

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

%Y A059455

%K nonn

%O 1,1

%A _Roger L. Bagula_ and _Gary W. Adamson_, Mar 11 2009

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Last modified October 1 17:45 EDT 2020. Contains 337444 sequences. (Running on oeis4.)