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1,1
Table of n, a(n) for n=1..7.
sigma(499997)+p(499997)=7890481=53^4.
(PARI) isok(n) = ispower(sigma(n) + prime(n), 4); \\ Michel Marcus, Jan 11 2014
Cf. A114081, subsequence of A114082.
Sequence in context: A208628 A205070 A169822 * A143475 A245948 A221004
Adjacent sequences: A114080 A114081 A114082 * A114084 A114085 A114086
nonn
Giovanni Resta, Feb 13 2006
approved