OFFSET
1,2
EXAMPLE
a(86) = 6480005 because 6 is divisible by 1^2, 64 by 2^2, 648 by 3^2, 6480 by 4^2, 64800 by 5^2, 648000 by 6^2, 6480005 by 7^2.
CROSSREFS
KEYWORD
easy,fini,full,nonn,base
AUTHOR
Sudipta Das (juitech(AT)vsnl.net), Feb 01 2003
STATUS
approved