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 A180025 #7 Mar 30 2012 18:52:13 %S A180025 7,19,109,631,811,919,991,1009,1801,2179,3511,3709,3889,4591,4969, %T A180025 6661,6841,7669,9109,9181,9199,12781,13339,14401,14851,15679,16741, %U A180025 17551,18451,19081,20071,20521,20899,22861,23041,23059,23599,24049,24499 %N A180025 Prime numbers 3*n-2 such that n, 2*n-1 and 3*n-2 are prime. %e A180025 3.5.7, 7.13.19, 37.73.109, 211.421.631, 271.541.811 = A174734.A137702.A180025 %t A180025 Select[Prime[Range[1000]], PrimeQ[2*#-1] && PrimeQ[3*#-2]&]*3-2 %Y A180025 Cf. A137702, A174734 %K A180025 nonn %O A180025 1,1 %A A180025 _Vladimir Joseph Stephan Orlovsky_, Jan 13 2011