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A194358

Triangle of divisors of 30^n, each number occurring once.

1, 2, 3, 5, 6, 10, 15, 30, 4, 9, 12, 18, 20, 25, 36, 45, 50, 60, 75, 90, 100, 150, 180, 225, 300, 450, 900, 8, 24, 27, 40, 54, 72, 108, 120, 125, 135, 200, 216, 250, 270, 360, 375, 500, 540, 600, 675, 750, 1000, 1080, 1125, 1350, 1500, 1800, 2250, 2700, 3000

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OFFSET

0,2

COMMENTS

The length of row k is A003215(k), the centered hexagonal numbers, 3k^2 + 3k + 1.

LINKS

T. D. Noe, Table of n, a(n) for n=0..9260 (rows 0..20)

EXAMPLE

The triangle has rows beginning with 2^k and ending with 30^k:

2, 3, 5, 6, 10, 15, 30

4, 9, 12, 18, 20, 25, 36, 45, 50, 60, 75, 90, 100, 150, 180, 225, 300, 450, 900

MATHEMATICA