Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #2 Mar 31 2012 10:22:08
%S 1,2,1,1,3,1,2,2,3,1,6,5,5,7,1,5,8,2,10,29,3,7,10,8,33,28,11,3,19,5,
%T 12,12,11,19,52,29,17,23,29,36,3,1,7,59,16,5,4,113,1,8,16,25,4,5,52,1,
%U 82,71,14,34,20,3,1,35,20,107,14,38,41,34,14,6,20,36,36,20,62,19,8,92,140
%N a(n) = m such that product n successive odd primes - 2*prime(n+m+1) is prime = such m that primorial(n+1)/2 - 2*prime(n+m+1) is prime.
%C When 1 occured in this sequence see A139463
%t k = 1; a = {}; Do[k = k*Prime[n]; m = 1; While[ ! PrimeQ[k - 2*Prime[n + m]], m++ ]; Print[m]; AppendTo[a, m], {n, 2, 200}]; a (*Artur Jasinski*)
%Y Cf. A067026, A067027, A139439, A139440, A139441, A139442, A139443, A139444, A139445, A139446, A139447, A139448, A139449, A139450, A139451, A139452, A139453, A139454, A139455, A139456, A139457, A103514, A139460, A139461, A139462, A139463.
%K nonn
%O 1,2
%A _Artur Jasinski_, Apr 22 2008