Sum of staircase twin primes according to the rule: top + bottom + next top.
13, 23, 41, 65, 101, 143, 191, 245, 311, 353, 425, 479, 551, 581, 623, 695, 749, 821
1 seqfan posts
Wed Aug 18 20:41:17 CEST 2010 [seqfan] Re: A135282: We can go ahead and change "seems" to "is known"