A359131 Number of odd primes in the Collatz trajectory of A177000(n).

0, 2, 1, 5, 4, 2, 3, 6, 5, 6, 2, 10, 8, 9, 7, 8, 6, 11, 9, 4, 7, 5, 8, 3, 9, 7, 4, 2, 3, 6, 9, 7, 10, 5, 8, 6, 11, 4, 2, 10, 3, 9, 10, 11, 12, 3, 6, 5, 11, 4, 10, 5, 3, 6, 7, 9, 7, 2, 7, 5, 8, 6, 4, 7, 5, 8, 3, 6, 9, 10, 5, 8, 3, 7, 8, 8, 13, 11, 11, 9, 12, 2

Offset: 1

Author

N. J. A. Sloane, Dec 29 2022, following a suggestion from Rudolfo Nieves

Keywords

• nonn

Comments

Equivalently, a(n) = A055509(A177000(n)).

Links

• Michael S. Branicky, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A055509, A078350, A078373, A177000.

Extensions

a(38) and beyond from Michael S. Branicky, Dec 30 2022