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 A352804 a(n) = A028876(n)/2; numbers k such that 4*k^2 - 5 is prime. 2
 2, 3, 4, 6, 7, 8, 11, 12, 16, 17, 18, 19, 21, 22, 23, 26, 29, 32, 36, 37, 39, 41, 47, 51, 56, 58, 61, 66, 72, 76, 82, 83, 84, 87, 88, 91, 92, 93, 94, 99, 102, 106, 111, 113, 116, 117, 118, 126, 131, 132, 139, 142, 144, 146, 149, 151, 159, 162, 171, 177, 179 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A028876 with common factor 2 removed. LINKS Jianing Song, Table of n, a(n) for n = 1..10000 MATHEMATICA Select[Range[200], PrimeQ[4*#^2 - 5] &] PROG (PARI) isA352804(n)=isprime(4*n^2-5) CROSSREFS Cf. A028876, A028877 (the resulting primes), A352805. Sequence in context: A274281 A050116 A061985 * A102826 A191381 A051602 Adjacent sequences: A352801 A352802 A352803 * A352805 A352806 A352807 KEYWORD nonn,easy AUTHOR Jianing Song, Apr 04 2022 STATUS approved

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Last modified August 9 14:37 EDT 2024. Contains 375042 sequences. (Running on oeis4.)