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A139417 Sum of digits of the square of the sum of the preceding numbers. 0

%I

%S 1,1,4,9,9,18,18,9,18,27,27,27,18,27,18,27,18,9,27,27,27,27,18,27,9,

%T 27,27,27,9,27,27,36,27,27,27,18,27,27,27,27,27,36,36,9,27,27,18,36,

%U 36,27,18,27,18,27,27,27

%N Sum of digits of the square of the sum of the preceding numbers.

%C As soon as a term is 9 or multiple of 9, which is true for a(4), all following ones are also multiple of 9, which never occurs in A065075.

%Y Cf. A065075.

%K base,easy,nonn

%O 1,3

%A Philippe Lallouet (philip.lallouet(AT)orange.fr), Apr 20 2008

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Last modified May 18 19:58 EDT 2021. Contains 344002 sequences. (Running on oeis4.)