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
KEYWORD
base,easy,nonn
AUTHOR
Ctibor O. Zizka, Nov 08 2008
STATUS
approved