OFFSET
0,2
COMMENTS
The length of row k is A003215(k), the centered hexagonal numbers, 3k^2 + 3k + 1.
LINKS
T. D. Noe, Rows n = 0..20
EXAMPLE
The triangle has rows beginning with 3^k and ending with 105^k:
1
3, 5, 7, 15, 21, 35, 105
9, 25, 45, 49, 63, 75, 147, 175, 225, 245, 315, 441, 525, 735, 1225, 1575, 2205, 3675, 11025
MATHEMATICA
Join[{{1}}, Table[Complement[Divisors[105^n], Divisors[105^(n-1)]], {n, 9}]]
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
T. D. Noe, Sep 08 2011
STATUS
approved