A373606 - OEIS

A373606

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

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

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OFFSET

0,8

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) - A373607(n).

a(n) = A373605(n) + A373607(n).

EXAMPLE

A049345(85) = 2401, and the sum of digits at even positions (with the rightmost position having index 0) is 1+4 = 5, thus a(85) = 5.

PROG