OFFSET
1,1
FORMULA
a(n) = prime(prime(n)+1)#/prime(n).
EXAMPLE
| p = | a(n) = product of p smallest
n | prime(n) | primes other than p
--+----------+--------------------------------------------
1 | 2 | 15 = 3 * 5
2 | 3 | 70 = 2 * 5 * 7
3 | 5 | 6006 = 2 * 3 * 7 * 11 * 13
4 | 7 | 1385670 = 2 * 3 * 5 * 11 * 13 * 17 * 19
MATHEMATICA
Table[a[i]=Product[Prime[j], {j, 1, Prime[i]+1}]/Prime[i], {i, 10}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Francesco Vissani, Jun 09 2019
STATUS
approved