A110965 Numbers k such that 23*k^2 + 25 is prime.

6, 18, 36, 42, 48, 66, 108, 126, 174, 198, 204, 216, 234, 246, 252, 312, 342, 372, 402, 426, 504, 516, 546, 564, 582, 618, 624, 642, 666, 702, 708, 732, 768, 774, 822, 852, 888, 906, 924, 936, 948, 966, 972, 978, 984, 996, 1008, 1014, 1032, 1062, 1092, 1098

Offset

1,1

Links

Table of n, a(n) for n=1..52.

Emre Alkan, Alexandru Zaharescu, Nonvanishing of the Ramanujan tau function in short intervals, International Journal of Number Theory, Vol. 1, No. 1 (2005) 45-51.

Example

23*198^2 + 25 = 901717 (prime).

Prog

(Magma) [ n: n in [0..1500] | IsPrime( 23*n^2 + 25) ] // Vincenzo Librandi, Jan 31 2011
(PARI) is(n)=isprime(23*n^2+25) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A038343 A271123 A271303 * A111147 A333821 A358843

Adjacent sequences: A110962 A110963 A110964 * A110966 A110967 A110968

Keyword

nonn,easy

Author

Parthasarathy Nambi, Sep 26 2005

Extensions

Edited by Don Reble, Nov 08 2005

Status

approved