OFFSET
1,1
COMMENTS
By definition, all terms are composite numbers.
Cannot be the hypotenuse of a primitive Pythagorean triangle. - Robert G. Wilson v, Mar 16 2014
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MATHEMATICA
fQ[n_] := Mod[ n, 4] == 1 && Mod[ FactorInteger[n][[1, 1]], 4] == 3; Select[Range@470, fQ] (* Robert G. Wilson v, Apr 08 2014 *)
PROG
(PARI) isok(n) = ((n % 4) == 1) && (f = factor(n)) && ((f[1, 1] % 4) == 3); \\ Michel Marcus, Mar 16 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
Vladimir Shevelev, Apr 13 2010
EXTENSIONS
More terms from Michel Marcus, Mar 16 2014
STATUS
approved