n, 2n+1, 4n+3 all prime.
2, 5, 11, 41, 89, 179, 359, 509, 719, 1019, 1031, 1229, 1409, 1451, 1481, 1511, 1811
2 seqfan posts
Sat Dec 4 13:07:56 CET 2010 [seqfan] Re: useless references?
Sat Dec 4 11:56:09 CET 2010 [seqfan] useless references?
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
Links to OEIS content are included according to
The OEIS End-User License Agreement
.