OFFSET
1,1
COMMENTS
EXAMPLE
609076 is a term because 609076 = 710^2 + 18^4, 609076^2 = 581940^2 + 424^4, 609076^3 = 475342920^2 + 676^4 and it is not divisible by 5.
PROG
(PARI) isA111925(n) = for(b=1, sqrtnint(n-1, 4), if(issquare(n-b^4), return(1))); 0;
isok(n) = n%5 != 0 && isA111925(n) && isA111925(n^2) && isA111925(n^3);
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Altug Alkan, Jun 12 2016
STATUS
approved