A221262 Numbers k such that sigma(k) is the fourth power of the sum of the prime divisors of k.

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

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