login
A048252
Largest number whose sum of divisors is 6^n.
5
1, 5, 22, 187, 1219, 7597, 46117, 278857, 1676377, 10067797, 60450517, 362758177, 2176626817, 13060193977, 78363525817, 470183516857, 2820894903487, 16926601754197, 101559860054047, 609359671998037, 3656158318966357
OFFSET
0,2
COMMENTS
Terms of this sequence are products of distinct terms in A005105. - Ray Chandler, Sep 01 2010
LINKS
PROG
(PARI) a(n) = {sn = 6^n; forstep(x=sn, 1, -1, if (sigma(x) == sn, return (x)); ); } \\ Michel Marcus, Dec 15 2013
KEYWORD
nonn
AUTHOR
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
STATUS
approved