A120313 - OEIS

%I #5 Jan 18 2013 08:27:11

%S 2,3,623645,124729,11339,19,667,29,49321,1591,43,146969,3127,59,

%T 23569729,386389,71,5767

%N a(n) = Product of k primes in arithmetic progression with common difference 6, otherwise a(n) = prime(n).

%e a(2) = 3 because 3+6 = 9 and is not prime;

%e a(3) = 623645 = 5*11*17*23*29 and the common difference between successive primes is 6.

%K nonn

%O 1,1

%A _Giovanni Teofilatto_, Jun 20 2006