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 A154419 Primes of the form 20*k^2 + 36*k + 17. 1
 17, 73, 953, 1249, 2377, 2833, 3329, 4441, 8737, 12401, 13417, 15569, 17881, 20353, 21649, 28729, 33457, 36809, 49801, 51817, 62497, 67049, 71761, 74177, 86857, 89513, 100537, 103393, 118273, 121369, 127681, 134153, 144161, 161641, 168913 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Also primes of the form 5*j^2 + 18*j + 17. (Proof: this format implies that j=2*k, even, because otherwise 5*j^2 + 18*j + 17 is even and cannot be prime. So 5*j^2 + 18*j + 17 = 20*k^2 + 36*k + 17.) - R. J. Mathar, Jan 12 2009 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 MATHEMATICA Select[Table[20n^2+36n+17, {n, 0, 6001}], PrimeQ] (* Vincenzo Librandi, Jul 23 2012 *) PROG (Magma)[a: n in [0..100] | IsPrime(a) where a is 20*n^2+36*n+17]; // Vincenzo Librandi, Jul 23 2012 (PARI) (for (n=0, 100, if (isprime (k=20*n^2+36*n+17), print1 (k, “, “)))) \\ Vincenzo Librandi, Jul 23 2012 CROSSREFS Cf. A017377, A154418. Sequence in context: A145440 A112013 A165691 * A208399 A097223 A296113 Adjacent sequences: A154416 A154417 A154418 * A154420 A154421 A154422 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, Jan 09 2009 STATUS approved

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Last modified July 15 21:59 EDT 2024. Contains 374334 sequences. (Running on oeis4.)