a(n) = the least positive d such that for p=prime(n), the numbers p+0d, p+1d, p+2d, ..., p+(p-1)d are all primes. See A113834 for last term in the progression.
1, 2, 6, 150, 1536160080, 9918821194590, 34197620478999233256
1 seqfan posts
Mon Oct 26 12:32:56 CET 2009 [seqfan] Arithmetic progressions of primes