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

Author

Giovanni Resta, Jan 07 2013

Keywords

• nonn

Examples

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

Links

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

Crossrefs

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