A258254 Denominators of partial sums of 1/A258252(i), 1 <= i <= n.

1, 2, 3, 1, 4, 3, 5, 2, 7, 5, 5, 6, 7, 1, 8, 6, 9, 3, 11, 8, 5, 12, 7, 9, 11, 2, 13, 11, 11, 14, 17, 3, 7, 4, 5, 11, 6, 13, 7, 8, 9, 10, 11, 12, 13, 1, 16, 12, 9, 15, 7, 20, 13, 19, 6, 17, 11, 16, 5, 14, 9, 13, 4, 11, 7, 17, 10, 13, 3, 23, 20, 17, 17, 12, 19, 7, 16, 9, 20

Offset: 1

Author

Ivan Neretin, May 24 2015

Keywords

• nonn

Comments

Presumably, every natural number appears infinitely many times.

A258252(n) is a divisor of lcm(a(n-1), a(n)). The first case when it is a proper divisor (rather than that number itself) occurs at n=169.

Links

• Ivan Neretin, Table of n, a(n) for n = 1..25000

Crossrefs

Cf. A258252, A002805 (analog for harmonic series).