A257804 Positions of even numbers in A233271, the infinite trunk of inverted binary beanstalk.

0, 2, 3, 5, 6, 8, 10, 11, 13, 14, 15, 16, 19, 20, 22, 26, 28, 29, 31, 32, 33, 36, 37, 39, 40, 43, 44, 45, 46, 47, 48, 50, 51, 56, 58, 59, 61, 62, 63, 66, 67, 69, 71, 72, 78, 79, 80, 84, 85, 86, 87, 88, 89, 91, 92, 94, 97, 98, 99, 100, 101, 102, 104, 105, 110, 112, 113, 115, 116, 117, 120, 121, 123, 124, 125, 126, 129, 130

Offset: 0

Author

Antti Karttunen, May 12 2015

Keywords

• nonn

Comments

We start indexing of this sequence from 0, because a(0) = 0 is a special case, which can be conveniently ignored by considering only the terms from a(1) onward.

Links

• Antti Karttunen, Table of n, a(n) for n = 0..8433

Crossrefs

Complement: A257803.

Cf. A233271, A257800, A257806, A257808.

Formula

Other identities. For all n >= 0:

A257808(a(n)) = n. [A257808 works as a left inverse for this injective function.]