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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; internal format)
OFFSET

0,2

FORMULA

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

EXAMPLE

1/sqrt(20736)=.0069444444444444444444; a(4)=20736.

CROSSREFS

Sequence in context: A205910 A206669 A205978 * A038676 A016840 A128832

Adjacent sequences:  A037208 A037209 A037210 * A037212 A037213 A037214

KEYWORD

nonn,base,nice

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

EXTENSIONS

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

More terms from Henry Bottomley (se16(AT)btinternet.com), Apr 28 2000

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Last modified February 15 17:46 EST 2012. Contains 205835 sequences.