A075068 Product of prime(n) primes starting from prime(n).

6, 105, 85085, 215656441, 2928046583754721, 50774191064678342417, 8893257265710151560293840093, 456136734556614681201275816106457, 413876828984538288243690385880996726353717

Offset: 1

Author

Amarnath Murthy, Sep 08 2002

Keywords

• nonn

Examples

			a(1) = 2*3=6, a(2) = 3*5*7= 105, a(4) = product of 7 primes, from 7 up to 29.
		

Links

• Michel Marcus, Table of n, a(n) for n = 1..60

Crossrefs

Cf. A000040, A002110.

Programs

PARI

a(n) = my(N=n+prime(n)-1, vp = primes(N)); prod(k=n, N, vp[k]); \\ Michel Marcus, Mar 08 2022

Formula

a(n) = A002110(n - 1 + A000040(n)) / A002110(n - 1). - Reinhard Zumkeller, Jan 06 2005

Extensions

More terms from David Wasserman, Jan 04 2005