A301600 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A301600

a(n) = Primorial(n) / Product_{k prime<n} k.

1, 2, 6, 15, 35, 385, 1001, 17017, 46189, 1062347, 30808063, 955049953, 3212440751, 131710070791, 435656388001, 20475850236047, 1085220062510491, 64027983688118969, 229747470880897477, 15393080549020130959, 57521511525285752531, 4199070341345859934763, 331726556966322934846277

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

COMMENTS

Sum_{n>=0} 1/a(n) = 1.765582555581609270...

LINKS

Table of n, a(n) for n=0..22.

FORMULA

a(0)=1, for n > 0 a(n) = A002110(n) / A034386(n-1).

EXAMPLE

a(5) = 2*3*5*7*11 / 2*3 = 385.

PROG