A194359 Triangle of divisors of 210^n, each number occurring once.

1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105, 210, 4, 9, 12, 18, 20, 25, 28, 36, 45, 49, 50, 60, 63, 75, 84, 90, 98, 100, 126, 140, 147, 150, 175, 180, 196, 225, 245, 252, 294, 300, 315, 350, 420, 441, 450, 490, 525, 588, 630, 700, 735, 882, 900

Offset

0,2

Comments

The length of row k is A005917, the rhombic dodecahedral numbers, (k+1)^4 - k^4. The triangle has rows beginning with 2^k and ending with 210^k.

Links

T. D. Noe, Rows n = 0..9

Mathematica

Join[{{1}}, Table[Complement[Divisors[210^n], Divisors[210^(n-1)]], {n, 9}]]
Take[DeleteDuplicates[Flatten[Divisors/@(210^Range[5])]], 100] (* Harvey P. Dale, Sep 03 2020 *)

Crossrefs

Cf. A018336, A194356, A194357, A194358.

Sequence in context: A028722 A030050 A018336 * A345166 A277006 A220355

Adjacent sequences: A194356 A194357 A194358 * A194360 A194361 A194362

Keyword

nonn,tabf

Author

T. D. Noe, Aug 26 2011

Status

approved