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A141391 a(n) is the smallest unused number such that the RMS (Root Mean Square) of a(1) through a(n) is an integer. 5
1, 7, 5, 11, 28, 14, 182, 70, 2, 66, 1518, 462, 1540, 616, 296, 600, 1950, 750, 10, 730, 2336, 876, 2436, 996, 3154, 1162, 5698, 210, 1554, 3234, 1638, 5382, 1872, 23088, 4368, 5934, 201, 4359, 77991, 7021, 13090, 4270, 12950, 74, 12802, 76466, 16954 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Actual RMS values are given by A141392

LINKS

Giovanni Resta, Table of n, a(n) for n = 1..200

EXAMPLE

a(4) = 11. Sqrt(mean(1^2, 7^2, 5^2, k^2)) is an integer for k in {5,11,37}. We have already used 5 for a(3), so 11 is the smallest value available for a(4).

CROSSREFS

Cf. A141392, A141393, A141394, A140480.

Sequence in context: A304136 A305042 A247870 * A135766 A067745 A070408

Adjacent sequences:  A141388 A141389 A141390 * A141392 A141393 A141394

KEYWORD

nonn

AUTHOR

Andrew Weimholt, Jun 29 2008

STATUS

approved

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Last modified September 21 01:47 EDT 2019. Contains 327252 sequences. (Running on oeis4.)