A114071 sigma(n) + n is a fourth power.

33, 7153, 16065, 29976, 36673, 39169, 117985, 849385, 2475045, 2757073, 5421336, 7137025, 9474784, 10797120, 11596833, 13627248, 15714240, 25586785, 26821458, 28849249, 37001785, 40441441, 43751896, 69748561, 70338768, 95516836

Offset

1,1

Links

Table of n, a(n) for n=1..26.

Example

sigma(33) + 33 = 81 = 3^4.

Prog

(PARI) isok(n) = ispower(sigma(n) + n, 4); \\ Michel Marcus, Jan 09 2014

Crossrefs

Cf. A155085, subsequence of A114069.

Sequence in context: A351136 A232365 A183551 * A330134 A210069 A316777

Adjacent sequences: A114068 A114069 A114070 * A114072 A114073 A114074

Keyword

nonn

Author

Giovanni Resta, Feb 13 2006

Extensions

a(9)-a(26) from Donovan Johnson, Feb 01 2009

Status

approved