OFFSET
0,2
LINKS
Zak Seidov, Table of n, a(n) for n = 0..51
EXAMPLE
a(0) = 0 since f(0) = 4 is divisible by 13^0 = 1,
a(1) = 11 since f(11) = 2026334063 is divisible by 13^1 = 13,
a(2) = 59 since f(59) = 72574551707704256929436010920458549301938388467823 is divisible by 13^2 = 169.
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Apr 30 2014
STATUS
approved