A100781 Triangle read by rows: n-th row contains n multiples of n not occurring earlier all even if n is even else all odd.

1, 2, 4, 3, 9, 15, 8, 12, 16, 20, 5, 25, 35, 45, 55, 6, 18, 24, 30, 36, 42, 7, 21, 49, 63, 77, 91, 105, 32, 40, 48, 56, 64, 72, 80, 88, 27, 81, 99, 117, 135, 153, 171, 189, 207, 10, 50, 60, 70, 90, 100, 110, 120, 130, 140, 11, 33, 121, 143, 165, 187, 209, 231, 253, 275, 297

Offset

1,2

Links

Table of n, a(n) for n=1..66.

Example

1
2 4
3 9 15
8 12 16 20
5 25 35 45 55
6 18 24 30 36 42
7 21 49 63 77 91 105
...

Crossrefs

Cf. A100782, A100783, A100784, A100785.

Sequence in context: A019600 A096901 A285268 * A358488 A110339 A223703

Adjacent sequences: A100778 A100779 A100780 * A100782 A100783 A100784

Keyword

easy,nonn,tabl

Author

Amarnath Murthy, Nov 30 2004

Extensions

Extended by Ray Chandler, Dec 10 2004

Status

approved