A280306 - OEIS

%I #22 Jan 01 2017 02:35:14

%S 0,0,1,2,2,4,4,13,13,16,16,28,28,46,46,46,46,77,77,48,48,48,48,117,

%T 117,141,141,134,134,213,213,326,326,326,326,326,326,352,352,352,352,

%U 389,389,413,413,413,413,508,508

%N a(n) = A049501(A003418(n)).

%C This calculates the major index (1st definition) of the LCM of all the numbers from 1 to n.

%H Indranil Ghosh, <a href="/A280306/b280306.txt">Table of n, a(n) for n = 0..10000</a>

%H Indranil Ghosh, <a href="/A280306/a280306.txt">Python Program to generate the sequence</a>

%e For n=10, the LCM of all the numbers from 1 to 10 is 2520 = 100111011000_2, whose major index (1st definition) is 16, so a(10)=16.

%Y Cf. A049501, A003418, A279519.

%K nonn,base

%O 0,4

%A _Indranil Ghosh_, Dec 31 2016