cp's OEIS Frontend

A142593 Irregular triangle read by rows: row n gives successive exponents in prime factorization of A141900(n).

%I A142593 #5 Mar 30 2012 17:21:02
%S A142593 1,2,1,3,1,4,1,1,5,1,1,6,1,1,1,7,1,1,1,8,3,1,1,9,3,1,1,10,3,1,1,1,11,
%T A142593 3,1,1,1,12,3,1,1,1,1,13,3,1,1,1,1,14,3,1,1,1,1,15,3,1,1,1,1,16,3,1,1,
%U A142593 1,1,1,17,3,1,1,1,1,1,18,3,1,1,1,1,1,1,19,3,1,1,1,1,1,1,20,3,1,1
%N A142593 Irregular triangle read by rows: row n gives successive exponents in prime factorization of A141900(n).
%H A142593 David Applegate, <a href="/A142593/a142593a.txt">Maple program which generates this triangle</a> [The command hpat(n); returns the n-th row in an encoded form.]
%H A142593 N. J. A. Sloane, <a href="/A142593/a142593b.txt">Rows 1 through 50 of the triangle</a>
%e A142593 Triangle begins:
%e A142593 1
%e A142593 2 1
%e A142593 3 1
%e A142593 4 1 1
%e A142593 5 1 1
%e A142593 6 1 1 1
%e A142593 7 1 1 1
%e A142593 8 3 1 1
%e A142593 9 3 1 1
%e A142593 10 3 1 1 1
%e A142593 11 3 1 1 1
%e A142593 12 3 1 1 1 1
%e A142593 Row 8 = [8,3,1,1] because A141900(8) = 2^8*3^3*5*7 = 241920.
%Y A142593 Cf. A141586, A141900, A142594.
%K A142593 nonn,tabf
%O A142593 1,2
%A A142593 _David Applegate_, Tim Kunisky (tkunisky(AT)gmail.com), Gerry Manoim (gerrymanoim(AT)gmail.com) and _N. J. A. Sloane_, Sep 25 2008