A165669 - OEIS

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A165669

First digit of the decimal expansion of (n^2+2)/7 after the decimal point.

2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4, 2, 4, 8, 5, 5, 8, 4

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OFFSET

0,1

COMMENTS

Periodic with period length 7.

LINKS

Table of n, a(n) for n=0..104.

FORMULA

a(n) = floor(10*(n^2+2)/7) mod 10. [R. J. Mathar, Sep 23 2009]

EXAMPLE

For n=0, (0^2+2)/7=0.285.... and 2 is the first digit after the point.

For n=1, (1^2+2)/7=0.4285..., and 4 is the first digit after the point.