A221262 - OEIS

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A221262

Numbers k such that sigma(k) is the fourth power of the sum of the prime divisors of k.

3

1056331752, 1061905992, 1823140011, 3564162938, 3667843058, 3722593056, 3754042656, 5732483592, 5836959090, 6021989960, 6260277320, 8433473570, 8799421778, 8845856138, 9976235103, 10655560968, 12961358020, 13736556801, 14606220127, 19398086442, 24066143955, 24746856018, 28520952292

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OFFSET

1,1

LINKS

Robert Gerbicz, Table of n, a(n) for n = 1..10000

EXAMPLE

1056331752 = 2^3*3*7*19*59*71*79 and sigma(1056331752) = (2+3+7+19+59+71+79)^4.

CROSSREFS

Cf. A187771 sigma(k)=sopf(k)^3, A221263 sigma(k)=sopf(k)^5.

Sequence in context: A167476 A051019 A051020 * A115940 A241812 A346652

Adjacent sequences: A221259 A221260 A221261 * A221263 A221264 A221265

KEYWORD

nonn

AUTHOR

Giovanni Resta, Jan 07 2013

STATUS

approved