OFFSET
1,1
COMMENTS
Subsequence of A266927.
Among the Gaussian integers, these numbers have two distinct prime factors, and four or more prime factors when counted with multiplicity. - Alonso del Arte, Mar 22 2016
EXAMPLE
125 is a term because 125 = 5^3 = 5^2 + 10^2.
169 is a term because 169 = 13^2 = 5^2 + 12^2.
512 is a term because 512 = 2^9 = 16^2 + 16^2.
PROG
(PARI) isA000404(n) = {for( i=1, #n=factor(n)~%4, n[1, i]==3 && n[2, i]%2 && return); n && ( vecmin(n[1, ])==1 || (n[1, 1]==2 && n[2, 1]%2))}
forcomposite(n=4, 1e5, if(isprimepower(n) && isA000404(n), print1(n, ", ")));
CROSSREFS
KEYWORD
nonn
AUTHOR
Altug Alkan, Mar 22 2016
STATUS
approved