This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A098027 #14 Oct 19 2017 03:14:36 %S A098027 3,13,103,1153,15013,255253,4849843,111546433,4360010653,100280245063, %T A098027 5245694198743,152125131763603,7149881192889433,421842990380476663, %U A098027 16294579238595022363,1106494163767990292293,74135108972455349583763 %N A098027 Smallest prime p such that p+2 is a product of exactly n distinct primes. %C A098027 In most cases a(n) = pn! - 2, where pn! is "factorial of odd primes": from 3 to n-th odd prime. - Zak Seidov - _Zak Seidov_ and _Don Reble_, Mar 10 2006 %e A098027 3+2=5 (1 prime), 13+2=15=3*5 (2 primes), 103+2=105=3*5*7 (3 primes), ... %e A098027 1153 is the 4th entry in the sequence because it is followed by primes 1783, 1993, 2143, 2803, ... with the property 1153+2 = 3*5*7*11, 1783+2 = 3*5*7*17, 1993+2 = 3*5*7*19, 2143+2 = 3*5*11*13, 2803+2 = 3*5*11*17, ... %Y A098027 Cf. A067024 [From _R. J. Mathar_, Sep 02 2008] %K A098027 nonn %O A098027 1,1 %A A098027 _Lekraj Beedassy_, Sep 10 2004 %E A098027 Extended by _Ray Chandler_, Sep 18 2004 %E A098027 More terms from _Zak Seidov_ and _Don Reble_, Mar 10 2006 %E A098027 Corrected by _Don Reble_, Apr 03 2006