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

1,2

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).

Links

Table of n, a(n) for n=1..80.

Formula

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

Crossrefs

Row lengths of A365434.

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

Sequence in context: A060766 A321015 A365195 * A029578 A054345 A368582

Adjacent sequences: A365430 A365431 A365432 * A365434 A365435 A365436

Keyword

nonn

Author

Omar E. Pol, Oct 18 2023

Status

approved