OFFSET
0,2
LINKS
Max Alekseyev, Table of n, a(n) for n = 0..100
EXAMPLE
a(0)=1 since sigma(1)=14^0=1. a(1)=13 since sigma(13)=14. a(2)=0 since no N exists such that sigma(N)=14^2. a(6)=2823492=2^2*3*7*33613 since sigma(2823492)=14^6 is the first 6th power. a(7)=36705396=2^2*3*7*13*33613 since sigma(36705396)=14^7 is the first 7th power.
CROSSREFS
KEYWORD
nonn
AUTHOR
Walter Kehowski, Aug 22 2010
EXTENSIONS
Edited (including b-file) by N. J. A. Sloane, Oct 05 2010
Terms a(25) onward from Max Alekseyev, Mar 04 2014
STATUS
approved