A225049 Numbers that can be expressed as n plus sum of squared digits(n) in more than one way.

30, 41, 56, 81, 95, 96, 98, 101, 112, 114, 121, 125, 131, 142, 146, 152, 157, 168, 173, 177, 182, 186, 191, 196, 197, 199, 206, 209, 213, 215, 216, 217, 227, 230, 232, 234, 240, 243, 245, 247, 248, 257, 260, 262, 266, 272, 276, 284, 285, 287, 292, 299, 300

Offset: 1

Author

Kevin L. Schwartz and Christian N. K. Anderson, Apr 25 2013

Keywords

• nonn
• base

Examples

			a(13) = 131 is included because 131 = 57+5^2+7^2 = 73+7^2+3^2 = 105+1^2+5^2 = 122 + 1^2+4^2+4^2.
		

Links

• Christian N. K. Anderson, Table of n, a(n) for n = 1..10000
• Christian N. K. Anderson, All the integers that yield a(n) for n=1..10000

Crossrefs

Cf. A225048, A003052, A003219, A003132, A062028, A066568.

Programs

R

digsqsum<-function(x) sum(as.numeric(unlist(strsplit(as.character(x),split="")))^2)
1:500+sapply(1:500,digsqsum)->y
table(y)->ty; names(ty[ty>1])