OFFSET
1,3
COMMENTS
FORMULA
a(n) = A082982(n) / 8.
PROG
(PARI) isA001481(n)=my(f=factor(n)); for(i=1, #f[, 1], if(f[i, 2]%2 && f[i, 1]%4==3, return(0))); 1
is(n)=isA001481(n) && isA001481(8*n+1) && isA001481(8*n+2) \\ Charles R Greathouse IV, May 17 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
M. F. Hasler, May 13 2018
STATUS
approved