A110480 - OEIS

A110480

Numbers n such that (n^2+6)/5 is prime.

2, 3, 7, 17, 23, 47, 53, 77, 133, 143, 157, 173, 193, 203, 217, 233, 247, 343, 347, 353, 373, 383, 427, 443, 457, 493, 527, 577, 583, 707, 767, 817, 823, 847, 857, 893, 907, 973, 1003, 1067, 1117, 1127, 1153, 1193, 1207, 1223, 1243, 1253, 1277, 1333, 1397

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

FORMULA

a(n) = Sqrt(A110481(n)).

MATHEMATICA

Select[Range[1500], PrimeQ[(#^2+6)/5]&] (* Harvey P. Dale, May 24 2013 *)

PROG

(PARI) is(n)=isprime((n^2+6)/5) \\ Charles R Greathouse IV, May 22 2017

CROSSREFS