A059863 a(n) = Product_{i=3..n} (prime(i)-4).

1, 1, 1, 3, 21, 189, 2457, 36855, 700245, 17506125, 472665375, 15597957375, 577124422875, 22507852492125, 967837657161375, 47424045200907375, 2608322486049905625, 148674381704844620625, 9366486047405211099375, 627554565176149143658125, 43301264997154290912410625

Offset: 1

Author

Labos Elemer, Feb 28 2001

Keywords

• nonn

References

• See A059862 for references.
• Steven R. Finch, Mathematical Constants, Cambridge, 2003, pp. 84-94.

Links

• C. K. Caldwell, Prime k-tuple Conjecture
• Steven R. Finch, Hardy-Littlewood Constants [Broken link]
• Steven R. Finch, Hardy-Littlewood Constants [From the Wayback machine]
• G. Niklasch, Some number theoretical constants: 1000-digit values [Cached copy]

Crossrefs

Cf. A049296, A002110, A005867, A000847, A022008, A051160-A051168, A048298, A059861-A059865.

Programs

PARI

a(n) = prod(i=3, n, prime(i)-4); \\ Michel Marcus, Aug 25 2019

Extensions

More terms from Michel Marcus, Aug 25 2019