%I #23 Nov 04 2023 12:47:02
%S 1,0,2,4,8,16,32,64,6,256,512,12,2048,4096,24,36,32768,48,131072,72,
%T 96,1048576,2097152,144,216,16777216,30,288,134217728,432,536870912,
%U 576,1536,4294967296,864,60,34359738368,68719476736,6144,1728,549755813888,2592,2199023255552
%N a(n) is the least k such that A343443(k) = n or 0 if there is no such k.
%C The indices for which a(n) = 2^(n-2) appear to be A232803. - _Michel Marcus_, May 05 2021
%C This is true. We can check it for n <= 10. For n > 10 there are only primes and twice primes in A232803. Any number k > 10 not in A232803 can be factored as k = m*p where m, p > 2 and m >= p. We then have A343443(2^(m-2)*3^(p-2)) = m*p = k. But 2^(k-2) = 2^(m*p-2) > 2^(m-2)*3^(p-2). As m, p > 2 we have 2^(m-2)*3^(p-2) not in A232803. - _David A. Corneth_, May 05 2021
%H David A. Corneth, <a href="/A343926/b343926.txt">Table of n, a(n) for n = 1..3325</a> (first 52 terms from Michel Marcus)
%F a(n) <= 2^(n-2) for n >= 3.
%Y Cf. A025487, A232803, A343443.
%K nonn
%O 1,3
%A _Michel Marcus_, May 04 2021