OFFSET
1,1
LINKS
Hiroaki Yamanouchi, Table of n, a(n) for n = 1..25
FORMULA
a(n) = A069554(5^n).
EXAMPLE
For n = 4, gcd(521875, 578125) = 3125 = 5^4.
For n = 8, a(8) = 5734841796875 = 5^9*2936239, reverse(a(8)) = 5786971484375 = 5^8*71*208657.
PROG
(PARI) a(n) = {my(k = 1); while (gcd(k, fromdigits(Vecrev(digits(k)))) != 5^n, k++); k; } \\ Michel Marcus, Jul 13 2018
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Labos Elemer, Jun 06 2002
EXTENSIONS
a(9)-a(18) from Hiroaki Yamanouchi, Sep 10 2014
STATUS
approved