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A181790 Numbers n such that n concatenated with itself is a pandigital biperiod square. 2
183673469387755102041, 326530612244897959184, 734693877551020408164, 132231404958677685950413223140496, 206611570247933884297520661157025, 297520661157024793388429752066116, 404958677685950413223140495867769 (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. A102567, A181789, A181791.

Sequence in context: A095436 A247262 A046061 * A252504 A338983 A338967

Adjacent sequences: A181787 A181788 A181789 * A181791 A181792 A181793

KEYWORD

nonn,base

AUTHOR

William Rex Marshall, Nov 12 2010

STATUS

approved

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Last modified December 1 23:44 EST 2022. Contains 358485 sequences. (Running on oeis4.)