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Place where n-th 1 occurs in A023131.
1

%I #3 Mar 30 2012 18:55:50

%S 1,4,10,19,31,46,63,83,106,132,161,193,227,264,304,347,393,442,493,

%T 547,604,664,727,793,861,932,1006,1083,1163,1246,1331,1419,1510,1604,

%U 1701,1800,1902,2007,2115,2226,2340,2456,2575,2697,2822,2950

%N Place where n-th 1 occurs in A023131.

%K nonn

%O 1,2

%A _Clark Kimberling_