A048252 Largest number whose sum of divisors is 6^n.

1, 5, 22, 187, 1219, 7597, 46117, 278857, 1676377, 10067797, 60450517, 362758177, 2176626817, 13060193977, 78363525817, 470183516857, 2820894903487, 16926601754197, 101559860054047, 609359671998037, 3656158318966357

Offset: 0

Author

Labos Elemer

Keywords

• nonn

Comments

Terms of this sequence are products of distinct terms in A005105. - Ray Chandler, Sep 01 2010

Links

• Ray Chandler, Table of n, a(n) for n = 0..1000

Crossrefs

Cf. A006532, A020477, A019422, A019423, A018427, A048251-A048256.

Programs

PARI

a(n) = {sn = 6^n; forstep(x=sn, 1, -1, if (sigma(x) == sn, return (x)););} \\ Michel Marcus, Dec 15 2013

Extensions

a(9)-a(14) from Donovan Johnson, Sep 02 2008

a(15)-a(20) from Donovan Johnson, Nov 22 2008

Edited and extended by Ray Chandler, Sep 01 2010