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Numbers that are divisible by the sum of the squares of their digits when alternately added and subtracted starting from units (rightmost).
1

%I #20 May 06 2013 13:23:25

%S 1,10,12,20,21,24,45,48,50,54,100,111,112,120,122,132,133,144,155,156,

%T 166,177,188,199,200,210,221,224,225,230,232,240,243,244,258,270,288,

%U 292,312,320,331,332,333,342,375,376,396,400,420,427,441,448,450,460,464,465,480,487,498,500

%N Numbers that are divisible by the sum of the squares of their digits when alternately added and subtracted starting from units (rightmost).

%H Carmine Suriano, <a href="/A221638/b221638.txt">Table of n, a(n) for n = 1..1500</a>

%e a(20)=156 since 6^2-5^2+1^2=12 divides 156.

%K nonn,base

%O 1,2

%A _Carmine Suriano_, May 04 2013