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A114071 sigma(n) + n is a fourth power. 0
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified June 27 04:16 EDT 2022. Contains 354888 sequences. (Running on oeis4.)