A025701 - OEIS

%I #5 Mar 30 2012 18:35:26

%S 1,3,6,10,16,23,31,40,51,63,76,90,106,123,141,160,181,203,226,250,276,

%T 303,331,361,392,424,457,492,528,565,603,643,684,726,769,814,860,907,

%U 955,1005,1056,1108,1161,1216,1272,1329,1388,1448,1509,1571,1635,1700,1766

%N Index of 4^n within sequence of numbers of form 3^i*4^j.

%K nonn

%O 1,2

%A _David W. Wilson_