OFFSET
1,1
COMMENTS
(8^n*(4^n+8); n = 0, 1, 2, ...) is an infinite subsequence of the subsequence A256613: see that entry for more details.
LINKS
Chai Wah Wu, Table of n, a(n) for n = 1..10000
EXAMPLE
(A, B, C) = (1, 4, 2): 1^3 + 4^4 + 2^5 = 1 + 256 + 32 = 289 = 17^2, so 17 is a term.
PROG
(PARI) for(D=3, 9999, for(C=1, sqrtn(D^2-2, 5), for(B=1, sqrtn(D^2-C^5-1, 4), ispower(D^2-C^5-B^4, 3)&&print1(D", "))))
(PARI) for(D=3, 9999, ok = 0; for(C=1, sqrtn(D^2-2, 5), for(B=1, sqrtn(D^2-C^5-1, 4), ispower(D^2-C^5-B^4, 3)&&(ok=1)&&print1(D", "); if (ok, break)); if (ok, break))) \\ Michel Marcus, Apr 26 2015
CROSSREFS
KEYWORD
nonn
AUTHOR
M. F. Hasler, Apr 04 2015
EXTENSIONS
Inserted a(5)=17 and removed the doublet 525 by Lars Blomberg, Apr 26 2015
STATUS
approved