

A057129


4 is a square mod n.


6



1, 2, 4, 5, 8, 10, 13, 17, 20, 25, 26, 29, 34, 37, 40, 41, 50, 52, 53, 58, 61, 65, 68, 73, 74, 82, 85, 89, 97, 100, 101, 104, 106, 109, 113, 116, 122, 125, 130, 136, 137, 145, 146, 148, 149, 157, 164, 169, 170, 173, 178, 181, 185, 193, 194, 197, 200, 202, 205, 212
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OFFSET

1,2


COMMENTS

Numbers that are not multiples of 16 and for which all odd prime factors are congruent to 1 mod 4.  Eric M. Schmidt, Apr 21 2013


LINKS



PROG

(Sage)
if n%16==0: return False
for (p, m) in factor(n) :
if p % 4 not in [1, 2] : return False
return True


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



