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 A137152 #2 Mar 31 2012 14:45:10
%S A137152 1,1,2,1,2,3,1,1,3,4,1,1,3,4,5,1,1,3,4,5,7,1,1,3,1,5,7,8,1,1,1,1,5,7,
%T A137152 8,9,1,1,1,1,5,7,8,9,11,1,1,1,1,5,7,8,9,11,13,1,1,1,1,5,7,1,9,11,13,
%U A137152 16,1,1,1,1,5,7,1,9,11,13,16,17,1,1,1,1,5,7,1,9,11,13,16,17,19,1,1,1,1,5,7,1
%N A137152 Triangle read by rows: prime powers whose row products give A051451.
%C A137152 Similar to tables A133232 and A133233.
%e A137152 The least common multiple of the first few rows are:
%e A137152 lcm{1} = 1
%e A137152 lcm{1,2} = 2
%e A137152 lcm{1,2,3} = 6
%e A137152 lcm{1,1,3,4} = 12
%e A137152 lcm{1,1,3,4,5} = 60
%e A137152 lcm{1,1,3,4,5,7} = 420
%e A137152 lcm{1,1,3,1,5,7,8} = 840
%e A137152 lcm{1,1,1,1,5,7,8,9} = 2520
%e A137152 lcm{1,1,1,1,5,7,8,9,11} = 27720
%e A137152 Multiplying the terms in the rows produces the same result:
%e A137152 1 = 1
%e A137152 1*2 = 2
%e A137152 1*2*3 = 6
%e A137152 1*1*3*4 = 12
%e A137152 1*1*3*4*5 = 60
%e A137152 1*1*3*4*5*7 = 420
%e A137152 1*1*3*1*5*7*8 = 840
%e A137152 1*1*1*1*5*7*8*9 = 2520
%e A137152 1*1*1*1*5*7*8*9*11 = 27720
%Y A137152 Cf. A051451.
%K A137152 nonn,tabl
%O A137152 1,3
%A A137152 _Mats Granvik_, Jan 24 2008