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%I #7 Jul 23 2018 09:04:55
%S 7,22,36,51,63,78,92,107,115,130,144,159,171,186,200,215,230,244,259,
%T 271,286,300,315,323,338,352,367,379,394,408,423,437,452,464,479,493,
%U 508,516,531,545,560,572,587,601,616,631,645,660,672,687,701,716,724,739,753,768,780,795,809,824
%N Indices of 3's in A254990.
%H Seiichi Manyama, <a href="/A316840/b316840.txt">Table of n, a(n) for n = 1..10000</a>
%Y Cf. A254990, A316837, A316838, A316839.
%K nonn
%O 1,1
%A _N. J. A. Sloane_, Jul 22 2018
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