A076927 a(n) = A076926(n)/n.

2, 3, 10, 105, 462, 5005, 72930, 4849845, 74364290, 646969323, 18232771830, 1236789689135, 23403866425170, 934482952262145, 40992652172566094, 16294579238595022365, 113103550009071331710, 19548063559901161830545

Offset

1,1

Links

Table of n, a(n) for n=1..18.

Formula

a(n) = denominator(n*sum(1/prime(k), k=1..n)). [Gary Detlefs, Dec 06 2011]

Maple

seq(lcm(product(ithprime(i), i=1..j), j)/j, j=1..40);

Prog

(PARI) a(n) = denominator(n*sum(k=1, n, 1/prime(k))); \\ Michel Marcus, May 26 2018

Crossrefs

Cf. A076926.

Sequence in context: A333332 A229220 A155148 * A064647 A119810 A055708

Adjacent sequences: A076924 A076925 A076926 * A076928 A076929 A076930

Keyword

nonn

Author

Amarnath Murthy, Oct 17 2002

Extensions

Corrected and extended by Sascha Kurz, Jan 03 2003

Status

approved