A147591 RootMeanSquare(digits of n) is an integer.

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

Offset: 1

Author

Ctibor O. Zizka, Nov 08 2008

Keywords

• base
• easy
• nonn

Examples

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

Links

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

Crossrefs

Cf. A140480

Programs

Mathematica

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