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%I #3 Mar 30 2012 16:51:56
%S 17,26,58,65,107,120,127,131,132,140,144,145,154,158,159,166,185,189,
%T 190,214,220,234,238,239,248,267,290,299,301,323,326,336,340,341,350,
%U 359,373,382,434,438,439,446,452,458,464,477,481,482,496
%N Positions of 4's in A181391.
%H N. J. A. Sloane, <a href="/A171954/b171954.txt">Table of n, a(n) for n = 1..1035</a>
%Y Cf. A181391, A171865, A171951-A171956.
%K nonn
%O 1,1
%A _N. J. A. Sloane_, Oct 29 2010
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