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a(n) is the least k such that A330896(k) = n.
2

%I #14 May 03 2020 15:31:27

%S 1,3,8,12,21,35,43,71,85,107,133,138,173,220,240,290,320,355,405,430,

%T 512,559,593,622,727,731,846,901,940,1071,1107,1207,1279,1389,1490,

%U 1544,1657,1699,1768,1870,1935,2049,2198,2346,2468,2478,2612,2693,2817,2919

%N a(n) is the least k such that A330896(k) = n.

%H Rémy Sigrist, <a href="/A330897/b330897.txt">Table of n, a(n) for n = 1..10000</a>

%H Rémy Sigrist, <a href="/A330897/a330897.txt">C program for A330897</a>

%F A330896(a(n)) = n.

%e The first terms of A330896 are:

%e n| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 ...

%e A330896(n)| 1 1 2 1 2 2 1 3 2 3 1 4 2 3 3 1 4 2 4 3 5 ...

%e - hence a(1) = 1, a(2) = 3, a(3) = 8, a(4) = 12, a(5) = 21.

%o (C) See Links section.

%Y Cf. A330896.

%K nonn

%O 1,2

%A _Rémy Sigrist_, May 01 2020