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A037211 Smallest natural number k such that periodic part of 1/sqrt(k) is n (or 0 if no such number). 1
1, 81, 2025, 9, 20736, 324, 36, 1296, 5184, 1, 9801, 81, 680625, 2509056, 160579584, 4356, 3828515625, 37387847900390625, 3025, 164433494016, 245025, 680625, 2025, 95712890625, 17015625, 156816, 627264, 1936, 40144896, 59820556640625 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

I believe a(n) = 0 will eventually occur (see A037207).

The smallest n such that A037207(n) = 0 is n = 101, so the smallest n such that a(n) = 0 is n = 101 as well. - Jianing Song, Feb 06 2019

LINKS

Table of n, a(n) for n=0..29.

FORMULA

a(n) = A037207(n)^2. - Henry Bottomley

EXAMPLE

1/sqrt(20736) = 0.0069444444444444444444; a(4) = 20736.

CROSSREFS

Cf. A037207.

Sequence in context: A236088 A253448 A205978 * A238237 A282861 A237376

Adjacent sequences:  A037208 A037209 A037210 * A037212 A037213 A037214

KEYWORD

nonn,base,nice

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from Henry Bottomley, Apr 28 2000

STATUS

approved

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Last modified May 9 13:42 EDT 2021. Contains 343742 sequences. (Running on oeis4.)