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a(n) is the greatest k such that A307730(k) = n.
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%I #14 Oct 21 2021 07:32:21

%S 1,3,6,11,51,16,58,34,25,69,1384,45,1397,82,97,152,3754,115,3773,223,

%T 135,1420,6702,175,344,1445,202,251,6731,374,84656,283,1479,3808,409,

%U 318,84693,3845,1617,541,89520,451,89563,1523,689,6778,91878,589,500,1073

%N a(n) is the greatest k such that A307730(k) = n.

%H Rémy Sigrist, <a href="/A348409/b348409.txt">Table of n, a(n) for n = 1..10000</a>

%H Rémy Sigrist, <a href="/A348409/a348409.txt">C program for A348409</a>

%F a(n) - A348246(n) >= n - 1.

%e For n = 6:

%e - sequence A307730 starts: 1, 2, 2, 3, 3, 3, 6, 4, 4, 4, 4, 6, 6, 6, 6, 6,

%e - the sixth occurrence of 6 appears at position 16,

%e - so a(6) = 16.

%o (C) See Links section.

%Y Cf. A307720, A307730, A348246.

%Y Records: A348253, A348254.

%K nonn

%O 1,2

%A _Rémy Sigrist_, Oct 17 2021