A114083 Numbers k such that sigma(k) plus the k-th prime gives a fourth power.

1432, 220425, 499997, 3437037, 3518771, 5693370, 8913770

Offset

1,1

Links

Table of n, a(n) for n=1..7.

Example

sigma(499997) + p(499997) = 7890481 = 53^4.

Prog

(PARI) isok(n) = ispower(sigma(n) + prime(n), 4); \\ Michel Marcus, Jan 11 2014

Crossrefs

Cf. A114081, subsequence of A114082.

Sequence in context: A208628 A205070 A169822 * A143475 A245948 A221004

Adjacent sequences: A114080 A114081 A114082 * A114084 A114085 A114086

Keyword

nonn

Author

Giovanni Resta, Feb 13 2006

Status

approved