OFFSET
0,2
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
FORMULA
a(n) = Min{k : A000203(k) = 6^n}.
EXAMPLE
sigma(k) = 1296 = 6^4 for each k in {510, 642, 710, 742, 782, 795, 862, 935, 1177, 1207, 1219}; the smallest of these is a(4)=510.
PROG
(PARI) a(n) = {my(k=1); while (sigma(k) != 6^n, k++); k; } \\ Michel Marcus, May 14 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
a(9)-a(14) from Donovan Johnson, Sep 02 2008
a(15)-a(24) from Walter Kehowski, Aug 22 2010
Edited and extended by Ray Chandler, Sep 01 2010
Error in sequence corrected by N. J. A. Sloane, Oct 04 2010
STATUS
approved