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A155737 Primes of the form 4*n^2 + 2*n -1. 3
5, 19, 41, 71, 109, 271, 419, 599, 701, 811, 929, 1481, 1979, 2161, 2351, 2549, 2969, 3191, 3659, 4159, 4421, 4691, 4969, 5851, 7481, 8929, 9311, 10099, 13109, 14519, 16001, 17029, 18089, 19181, 19739, 20879, 22051, 23869, 25121, 25759, 27059 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Primes in A125202. - Klaus Purath, Dec 09 2020
LINKS
MATHEMATICA
Select[Table[4n^2+2n-1, {n, 0, 200}], PrimeQ] (* Vincenzo Librandi, Jul 23 2012 *)
PROG
(Magma) [a: n in [0..100] | IsPrime(a) where a is 4*n^2+2*n-1]; // Vincenzo Librandi, Jul 23 2012
(PARI) (for (n=0, 100, if (isprime (k=4*n^2+2*n-1), print1 (k, ", ")))); \\ Vincenzo Librandi, Jul 23 2012
CROSSREFS
Sequence in context: A031379 A125202 A024841 * A100572 A119534 A306190
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Jan 26 2009
EXTENSIONS
Incorrect formula deleted by N. J. A. Sloane, Jun 16 2010
STATUS
approved

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Last modified May 22 21:38 EDT 2024. Contains 372758 sequences. (Running on oeis4.)