|
%I #2 Mar 30 2012 16:51:55
%S 4,9,6,14,9,6,33,14,9,6,62,33,14,9,6,177,62,33,14,9,6,886,445,94,49,
%T 14,9,6,2649,886,445,94,49,14,9,6,5294,2649,886,445,94,49,14,9,6,
%U 68653,5294,2649,886,445,94,49,14,9,6,496966,248485,49702,24853,886
%N Triangle read by rows: row n contains sequence S_n = [s(1), ..., s(n)] where s(1) is the least semiprime pq such that the recurrence s(i+1) = sum of two prime factors of s(i) generates a chain of exactly n semiprimes.
%e Triangle begins:
%e 4
%e 9, 6
%e 14, 9, 6
%e 33, 14, 9, 6
%e 62, 33, 14, 9, 6
%e 177, 62, 33, 14, 9, 6
%e 886, 445, 94, 49, 14, 9, 6
%e 2649, 886, 445, 94, 49, 14, 9, 6
%e 5294, 2649, 886, 445, 94, 49, 14, 9, 6
%e 68653, 5294, 2649, 886, 445, 94, 49, 14, 9, 6
%e 496966, 248485, 49702, 24853, 886, 445, 94, 49, 14, 9, 6
%e 1490889, 496966, 248485, 49702, 24853, 886, 445, 94, 49, 14, 9, 6
%e 16896262, 8448133, 496966, 248485, 49702, 24853, 886, 445, 94, 49, 14, 9, 6
%e 185858761, 16896262, 8448133, 496966, 248485, 49702, 24853, 886, 445, 94, 49, 14, 9, 6
%e ...
%K nonn,tabl
%O 1,1
%A _N. J. A. Sloane_, Sep 23 2010, based on a posting to the Sequence Fans Mailing List by Hans Havermann, Sep 10 2010
|
