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 A092057 Primes of the form 2*p^2 - 1, where p is prime. 9
 7, 17, 97, 241, 337, 577, 3361, 3697, 6961, 10657, 23761, 25537, 32257, 37537, 49297, 64081, 65521, 77617, 79201, 89041, 126001, 138337, 153457, 171697, 193441, 249217, 269377, 287281, 334561, 351121, 374977, 474337, 633937, 652081, 665857 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS T. D. Noe, Table of n, a(n) for n = 1..1000 MATHEMATICA lst={}; Do[p=Prime[n]; If[PrimeQ[r=2*p^2-1], AppendTo[lst, r]], {n, 6!}]; lst (* Vladimir Joseph Stephan Orlovsky, Jun 20 2009 *) Select[2#^2-1&/@Prime[Range[200]], PrimeQ] (* Harvey P. Dale, Jun 26 2017 *) PROG (PARI) for (i=1, 300, if(isprime(2*prime(i)^2-1), print1(2*prime(i)^2-1, ", "))) CROSSREFS Cf. A092058. Cf. A106483 (primes p such that 2p^2 - 1 is also prime). Sequence in context: A177123 A124165 A239150 * A082738 A092340 A181605 Adjacent sequences:  A092054 A092055 A092056 * A092058 A092059 A092060 KEYWORD easy,nonn AUTHOR Mohammed Bouayoun (mohammed.bouayoun(AT)sanef.com), Feb 19 2004 STATUS approved

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Last modified August 17 11:22 EDT 2017. Contains 290635 sequences.