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A114083 Numbers n such that sigma(n) plus the n-th prime gives a fourth power. 2
1432, 220425, 499997, 3437037, 3518771, 5693370, 8913770 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 2 04:09 EDT 2014. Contains 247527 sequences.