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A147591 RootMeanSquare(digits of n) is an integer. 1
1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 17, 22, 33, 44, 55, 66, 71, 77, 88, 99, 111, 115, 151, 157, 175, 222, 333, 444, 511, 517, 555, 571, 666, 715, 751, 777, 888, 999, 1111, 1135, 1153, 1177, 1315, 1339, 1351, 1393, 1513, 1531, 1557, 1575, 1717, 1755, 1771, 1933, 2000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

EXAMPLE

n=1236, RMS(digits of 1351)=sqrt((1^2+3^2+5^2+1^2)/4)=sqrt(36/4)=sqrt(9)=3.

MATHEMATICA

Select[Range[2000], IntegerQ[RootMeanSquare[IntegerDigits[#]]]&] (* Harvey P. Dale, Sep 02 2017 *)

CROSSREFS

Cf. A140480

Sequence in context: A001103 A265730 A304248 * A271954 A330969 A033074

Adjacent sequences:  A147588 A147589 A147590 * A147592 A147593 A147594

KEYWORD

base,easy,nonn

AUTHOR

Ctibor O. Zizka, Nov 08 2008

STATUS

approved

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Last modified April 18 19:31 EDT 2021. Contains 343089 sequences. (Running on oeis4.)