login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A030995 9-automorphic numbers ending in 5: final digits of 9*n^2 agree with n. 1
5, 25, 625, 5625, 65625, 765625, 4765625, 34765625, 134765625, 3134765625, 13134765625, 213134765625, 2213134765625, 62213134765625, 362213134765625, 7362213134765625, 17362213134765625 (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 9*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(9, 2^n), 0, 2^n, 5^n) for n in xrange(1, 1001)] # Eric M. Schmidt, Aug 18 2012

CROSSREFS

Sequence in context: A078260 A007185 A175852 * A067270 A215118 A218150

Adjacent sequences:  A030992 A030993 A030994 * A030996 A030997 A030998

KEYWORD

nonn,base

AUTHOR

Eric W. Weisstein

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified October 20 15:44 EDT 2017. Contains 293626 sequences.