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%I #19 Jun 11 2019 03:16:13
%S 15,70,6006,1385670,674612557710,1006366256282310,
%T 6899316550553351234310,29365306848773629524600810,
%U 1033423560710676120463066852232970,1090001884152331303039489872122195258388782310
%N a(n) is the product of the prime(n) smallest primes other than prime(n).
%F a(n) = prime(prime(n)+1)#/prime(n).
%e | p = | a(n) = product of p smallest
%e n | prime(n) | primes other than p
%e --+----------+--------------------------------------------
%e 1 | 2 | 15 = 3 * 5
%e 2 | 3 | 70 = 2 * 5 * 7
%e 3 | 5 | 6006 = 2 * 3 * 7 * 11 * 13
%e 4 | 7 | 1385670 = 2 * 3 * 5 * 11 * 13 * 17 * 19
%t Table[a[i]=Product[Prime[j],{j,1,Prime[i]+1}]/Prime[i],{i,10}]
%Y Cf. A002110, A306237.
%K nonn
%O 1,1
%A _Francesco Vissani_, Jun 09 2019