A358234 Number of ways 2n can be expressed as an unordered product of two natural numbers that do not generate any carries when added together in the primorial base.

1, 2, 2, 1, 1, 2, 2, 2, 3, 1, 1, 4, 2, 3, 3, 1, 1, 4, 2, 2, 4, 1, 1, 4, 2, 3, 4, 2, 1, 5, 2, 3, 3, 1, 2, 6, 2, 3, 4, 1, 1, 4, 2, 2, 5, 1, 1, 6, 3, 3, 3, 2, 1, 5, 2, 4, 4, 1, 1, 7, 2, 3, 6, 1, 2, 5, 2, 2, 3, 2, 1, 6, 2, 3, 4, 2, 2, 3, 2, 3, 4, 1, 1, 6, 2, 3, 2, 1, 1, 8, 3, 2, 4, 1, 2, 5, 2, 4, 5, 1, 1, 5, 2, 3, 6

Offset: 1

Author

Antti Karttunen, Nov 26 2022

Keywords

• nonn
• base

Links

• Antti Karttunen, Table of n, a(n) for n = 1..16384
• Index entries for sequences related to primorial base

Crossrefs

Bisection of A358233.

Programs

PARI

A358234(n) = A358233(n+n);

Formula

a(n) = A358233(2*n).