A232547 Numbers n such that sigma(n^2) mod sigma(n) = n.

7581, 988893, 1658073, 468539757, 35124206517

Offset

1,1

Comments

a(6) > 10^12. - Giovanni Resta, Jun 10 2016

Links

Table of n, a(n) for n=1..5.

Crossrefs

Cf. A000203 (sigma(n) = sum of divisors of n), A065764, A232703, A247222.

Sequence in context: A254902 A257204 A204358 * A028539 A234204 A190077

Adjacent sequences: A232544 A232545 A232546 * A232548 A232549 A232550

Keyword

nonn,more

Author

Alex Ratushnyak, Nov 25 2013

Extensions

a(5) from Giovanni Resta, Jun 10 2016

Status

approved