0,2

It would be nice to have a more precise definition.

At least the first 31 terms coincide with (2n+1)*A002326(n). - Jon Maiga, Feb 16 2021

Table of n, a(n) for n=0..30.

Jonas Kaiser, On the relationship between the Collatz conjecture and Mersenne prime numbers, arXiv preprint arXiv:1608.00862 [math.GM], 2016. See Table 1.

Cf. A002326.

Sequence in context: A063601 A222604 A112809 * A237043 A243905 A062017

Adjacent sequences: A289656 A289657 A289658 * A289660 A289661 A289662

nonn,more

N. J. A. Sloane, Jul 24 2017

approved