OFFSET
1,1
LINKS
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*156^2 + 49 = 559777 (prime).
PROG
(Magma) [ n: n in [0..1500] | IsPrime( 23*n^2 + 49) ] // Vincenzo Librandi, Jan 31 2011
(PARI) is(n)=isprime(23*n^2+49) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Parthasarathy Nambi, Sep 26 2005
EXTENSIONS
Edited by Don Reble, Nov 08 2005
STATUS
approved