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A110872
Numbers n such that (n^2+7)/8 is prime.
4
3, 7, 9, 15, 17, 23, 25, 33, 39, 41, 47, 55, 71, 81, 87, 89, 95, 103, 113, 121, 127, 129, 137, 143, 151, 153, 169, 177, 191, 193, 199, 201, 215, 223, 225, 263, 265, 271, 281, 297, 319, 327, 335, 337, 345, 351, 359, 369, 375, 401, 407, 415, 417, 423, 439, 447
OFFSET
1,1
LINKS
FORMULA
a(n) = 2*A067186(n) + 1 = Sqrt(A110873(n)).
MATHEMATICA
Select[Range[300], PrimeQ[(#^2 + 7)/8] &] (* Ray Chandler, Oct 08 2005 *)
PROG
(PARI) is(n)=isprime((n^2+7)/8) \\ Charles R Greathouse IV, May 22 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Giovanni Teofilatto, Sep 18 2005
EXTENSIONS
Extended by Ray Chandler, Oct 08 2005
STATUS
approved