login
The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A181791
Numbers with pandigital biperiod squares.
2
428571428571428571429, 571428571428571428572, 857142857142857142858, 363636363636363636363636363636364, 454545454545454545454545454545455, 545454545454545454545454545454546, 636363636363636363636363636363637
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
REFERENCES
R. Ondrejka, Problem 1130: Biperiod Squares, Journal of Recreational Mathematics, Vol. 14:4 (1981-82), 299. Solution by F. H. Kierstead, Jr., JRM, Vol. 15:4 (1982-83), 311-312.
LINKS
Table of n, a(n) for n=1..7.
CROSSREFS
Cf. A106497, A181789, A181790.
Sequence in context: A338983 A338967 A239924 * A217431 A173471 A291215
Adjacent sequences: A181788 A181789 A181790 * A181792 A181793 A181794
KEYWORD
nonn,base
AUTHOR
William Rex Marshall, Nov 12 2010
STATUS
approved

Lookup Welcome Wiki Register Music Plot 2 Demos Index WebCam Contribute Format Style Sheet Transforms Superseeker Recents
The OEIS Community
Maintained by The OEIS Foundation Inc.
Last modified December 4 23:07 EST 2024. Contains 378421 sequences.
License Agreements, Terms of Use, Privacy Policy