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A147523 a(n) = number of n-digit terms in A058369. 2

%I #6 Mar 30 2012 17:35:01

%S 3,8,37,195,1159,6951,42421,261430,1631123,10238173,64536808

%N a(n) = number of n-digit terms in A058369.

%e a(1)=3: 0,1,9; a(2)=8: 10,18,19,45,46,55,90,99.

%Y A058369 Numbers n such that n and n^2 have same digit sum. A004159 Sum of digits of n^2. A007953 Digital sum (i.e. sum of digits) of n.

%K base,nonn

%O 1,1

%A _Zak Seidov_, Apr 25 2009

%E a(9) from _Donovan Johnson_, Dec 08 2009

%E a(10)-a(11) from _Donovan Johnson_, Jul 31 2011

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Last modified April 24 18:17 EDT 2024. Contains 371962 sequences. (Running on oeis4.)