%I A120313
%S A120313 2,3,623645,124729,11339,19,667,29,49321,1591,43,146969,3127,59,
%T A120313 23569729,386389,71,5767
%N A120313 a(n) = Product of k primes in arithmetic progression with common difference 
               6, otherwise a(n) = prime(n).
%e A120313 a(2) = 3 beacuse 3+6 = 9 and is not prime;
%e A120313 a(3) = 623645 = 5*11*17*23*29 and the common difference between successive 
               primes is 6.
%Y A120313 Sequence in context: A101445 A128668 A038537 this_sequence A082871 A139627 
               A166926
%Y A120313 Adjacent sequences: A120310 A120311 A120312 this_sequence A120314 A120315 
               A120316
%K A120313 nonn
%O A120313 1,1
%A A120313 Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Jun 20 2006