OFFSET
1,2
COMMENTS
There are no multiples of 8 in the triangle.
A047592 contains a sorted list of all elements of the triangle.
The triangle is a member of a family of triangles with parameter k that list the k positions of 2*n-1: 2*n-1 in A000027 (k=1), A043547 the k=2 positions in A026741, the triangle 1,2,4,8; 3,6,12,24;... with the k=4 positions in A106609, or the triangle 1,2,4,8,16; 3,6,12,24,48;... with the k=5 positions in A106617.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
FORMULA
T(n,1) = 2*n-1. T(n,2) = 4*n-2. T(n,3) = 8*n-4.
EXAMPLE
MATHEMATICA
numberOfTriplets = 19; A060819 = Table[n/GCD[n, 4], {n, 1, 8*numberOfTriplets}]; Table[Position[A060819, 2*n-1], {n, 1, numberOfTriplets}] // Flatten (* Jean-François Alcover, Apr 30 2013 *)
CROSSREFS
KEYWORD
nonn,tabf,easy
AUTHOR
Paul Curtz, Apr 26 2013
STATUS
approved