A365433 Height of the ziggurat of order n described in A347186.

1, 2, 2, 4, 3, 6, 4, 8, 5, 9, 6, 12, 7, 12, 10, 16, 9, 18, 10, 20, 13, 18, 12, 24, 13, 21, 16, 28, 15, 30, 16, 32, 19, 27, 21, 36, 19, 30, 22, 40, 21, 42, 22, 42, 40, 36, 24, 48, 25, 39, 28, 49, 27, 54, 36, 56, 31, 45, 30, 60, 31, 48, 36, 64, 41, 66, 34, 63, 37, 56, 36, 72, 37, 57, 61, 70, 50, 77, 40, 80

Offset: 1

Author

Omar E. Pol, Oct 18 2023

Keywords

• nonn

Comments

The values of a(n) where a(n) = n give A174973.

The values of a(n) where a(n) is not equal to n give A238524.

If n is an odd prime then a(n) = (n + 1)/2.

Since this is a supersequence of A174973 so all powers of 2 and all even perfect numbers are in the sequence.

Shares infinitely many terms with A365195 from which first differs at a(15).

Crossrefs

Row lengths of A365434.

Cf. A000079, A000396, A065091, A174973, A196020, A235791, A236104, A237270, A237271, A237591, A237593, A238524, A245092, A262626, A347186, A347263, A347367, A365195.

Formula

a(2*n-1) >= n.