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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

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Last modified December 7 10:26 EST 2022. Contains 358656 sequences. (Running on oeis4.)