A352804 a(n) = A028876(n)/2; numbers k such that 4*k^2 - 5 is prime.
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
Offset: 1
Links
- Jianing Song, Table of n, a(n) for n = 1..10000
Programs
-
Mathematica
Select[Range[200], PrimeQ[4*#^2 - 5] &]
-
PARI
isA352804(n)=isprime(4*n^2-5)
Comments