A271577 Powers, squares excepted, of the form x^2+y^4, with x,y > 0 (see A111925).

32, 512, 2197, 3125, 8000, 8192, 15625, 64000, 100000, 131072, 1419857, 1953125, 2097152, 3200000, 7189057, 8000000, 8998912, 9765625, 11390625, 11881376, 30664297, 32768000, 33554432, 35287552, 62748517, 64000000, 69343957, 115856201, 125000000, 221445125, 262144000, 272097792

Offset: 1

Author

Michel Marcus, Apr 10 2016

Keywords

• nonn

Examples

			32 = 2^5 = 16 + 16 = 2^2 + 2^4, so 32 is a term.
		

Links

• Chai Wah Wu, Table of n, a(n) for n = 1..1255

Crossrefs

Cf. A111925, A271576.

Programs

PARI

isok(n) = {if ((p=ispower(n)) && (p != 2), for (k=1, n-1, if (issquare(k) && (p=ispower(n-k, 4)), return (1));););}