

A030988


5automorphic numbers: final digits of 5n^2 agree with n.


1



5, 25, 125, 8125, 78125, 578125, 2578125, 42578125, 642578125, 3642578125, 83642578125, 983642578125, 1983642578125, 51983642578125, 251983642578125, 1251983642578125, 51251983642578125
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


COMMENTS

a(n) is the unique positive integer less than 10^n such that a(n) is divisible by 5^n and 5*a(n)  1 is divisible by 2^n.  Eric M. Schmidt, Aug 18 2012


LINKS

Eric M. Schmidt, Table of n, a(n) for n = 1..1000
Index entries for sequences related to automorphic numbers
Index entries for sequences related to final digits of numbers
Eric Weisstein's World of Mathematics, Automorphic Number


PROG

(Sage) [crt(inverse_mod(5, 2^n), 0, 2^n, 5^n) for n in range(1, 1001)] # Eric M. Schmidt, Aug 18 2012


CROSSREFS

Sequence in context: A306570 A061835 A321288 * A173260 A080516 A033141
Adjacent sequences: A030985 A030986 A030987 * A030989 A030990 A030991


KEYWORD

nonn,base


AUTHOR

Eric W. Weisstein


STATUS

approved



