A361643 - OEIS

A361643

The binary expansion of a(n) specifies which primes divide A359804(n).

0, 1, 2, 4, 1, 3, 5, 8, 2, 1, 6, 9, 16, 3, 5, 10, 17, 4, 3, 9, 7, 18, 12, 1, 3, 5, 11, 17, 6, 8, 33, 2, 5, 9, 3, 20, 10, 1, 7, 13, 19, 32, 36, 65, 34, 6, 129, 24, 3, 5, 11, 17, 68, 66, 257, 7, 40, 18, 33, 132, 3, 9, 5, 130, 14, 513, 21, 258, 9, 260, 3, 72, 7

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OFFSET

1,3

LINKS

Rémy Sigrist, Table of n, a(n) for n = 1..10000

Rémy Sigrist, PARI program

FORMULA

a(n) = A087207(A359804(n)).

EXAMPLE

The first terms, in decimal and in binary, alongside A359804(n) and its divisibility by small prime numbers, are:

n a(n) bin(a(n)) A359804(n) Divisibility by:

7 5 3 2