1

The first six terms of A308007 lie on both lines, so a(n) for n <= 6 is both 0 and 1.

More than the usual number of terms are given in order to show the irregularities.

It is only a (strong) conjecture that the terms of A308007 line on two lines. Certainly this is true for the first million terms.

N. J. A. Sloane, Table of n, a(n) for n = 1..5000

Cf. A081145, A308007, A308009.

Sequence in context: A014191 A014086 A014163 * A166360 A204183 A204177

Adjacent sequences: A308013 A308014 A308015 * A308017 A308018 A308019

nonn

N. J. A. Sloane, May 15 2019

approved