A367623 Number of comma-children of n in base 3.

2, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1

Offset: 1

Author

N. J. A. Sloane, Dec 23 2023

Keywords

• nonn
• base

Links

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

Crossrefs

Cf. A121805, A367355, A367356, A367606-A367609, A367622.

Programs

Python

from sympy.ntheory.factor_ import digits
def a(k, base=3):
    m = k + base*(k%base)
    return len([m+y for y in range(1, base) if digits(m+y, base)[1] == y])
print([a(n) for n in range(1, 96)]) # Michael S. Branicky, Dec 23 2023