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A020340 Least square base n doublet (written in base 10). 9
36, 4, 378225, 7056, 14393520729, 16, 9, 557904400, 1322314049613223140496, 36, 613401598811409576100, 321418490709904, 837225, 16, 7535664872989640713426833504575377836025, 36, 16900, 100, 7112889 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

REFERENCES

David Wells, "The Penguin Dictionary of Curious and Interesting Numbers", Revised Edition 1997, p. 189.

LINKS

Table of n, a(n) for n=2..20.

A. Ottens, The arithmetic-digits-squares-three.digits problem

CROSSREFS

Cf. A020339, A054214, A054215, A054216, A030465, A030466, A030467.

Sequence in context: A285575 A227168 A100252 * A255868 A289138 A181759

Adjacent sequences:  A020337 A020338 A020339 * A020341 A020342 A020343

KEYWORD

base,nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified November 18 14:59 EST 2019. Contains 329262 sequences. (Running on oeis4.)