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A030986 3-automorphic numbers ending in 5: final digits of 3*n^2 agree with n. 1
5, 75, 875, 6875, 96875, 296875, 4296875, 4296875, 404296875, 9404296875, 39404296875, 639404296875, 6639404296875, 86639404296875, 86639404296875, 2086639404296875, 52086639404296875 (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 3*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(3, 2^n), 0, 2^n, 5^n) for n in xrange(1, 1001)] # Eric M. Schmidt, Aug 18 2012

CROSSREFS

Sequence in context: A105490 A307823 A105494 * A284924 A248340 A224088

Adjacent sequences:  A030983 A030984 A030985 * A030987 A030988 A030989

KEYWORD

nonn,base

AUTHOR

Eric W. Weisstein

STATUS

approved

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Last modified November 13 12:45 EST 2019. Contains 329094 sequences. (Running on oeis4.)