A373607 - OEIS

A373607

Sum of the odd-indexed digits in the primorial base representation (A049345) of n.

0, 0, 1, 1, 2, 2, 0, 0, 1, 1, 2, 2, 0, 0, 1, 1, 2, 2, 0, 0, 1, 1, 2, 2, 0, 0, 1, 1, 2, 2, 1, 1, 2, 2, 3, 3, 1, 1, 2, 2, 3, 3, 1, 1, 2, 2, 3, 3, 1, 1, 2, 2, 3, 3, 1, 1, 2, 2, 3, 3, 2, 2, 3, 3, 4, 4, 2, 2, 3, 3, 4, 4, 2, 2, 3, 3, 4, 4, 2, 2, 3, 3, 4, 4, 2, 2, 3, 3, 4, 4, 3, 3, 4, 4, 5, 5, 3, 3, 4, 4, 5, 5, 3, 3, 4, 4

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OFFSET

0,5

LINKS

Antti Karttunen, Table of n, a(n) for n = 0..16170

Index entries for sequences related to primorial base

FORMULA

a(n) = A276150(n) - A373606(n).

a(n) = A373606(n) - A373605(n).

EXAMPLE

A049345(85) = 2401, and the sum of digits at the odd positions (with the rightmost digit having index 0) is 0+2 = 2, thus a(85) = 2.

PROG