A337661 - OEIS

A337661

Triangular array read by rows: T(n,k) = A337655(n) * A337655(k), for 1 <= k <= n.

1, 2, 4, 5, 10, 25, 7, 14, 35, 49, 15, 30, 75, 105, 225, 22, 44, 110, 154, 330, 484, 31, 62, 155, 217, 465, 682, 961, 50, 100, 250, 350, 750, 1100, 1550, 2500, 68, 136, 340, 476, 1020, 1496, 2108, 3400, 4624, 90, 180, 450, 630, 1350, 1980, 2790, 4500, 6120, 8100

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

This is the lower triangular part of the multiplication table from A337655, read by rows.

LINKS

Peter Kagey, Table of n, a(n) for n = 1..10011 (first 141 rows, flattened)

EXAMPLE

The multiplication table from A337655 begins:

1, 2, 5, 7, 15, 22, 31, 50, 68, 90, ...

2, 4, 10, 14, 30, 44, 62, 100, 136, 180, ...

5, 10, 25, 35, 75, 110, 155, 250, 340, 450, ...

7, 14, 35, 49, 105, 154, 217, 350, 476, 630, ...

15, 30, 75, 105, 225, 330, 465, 750, 1020, 1350, ...

22, 44, 110, 154, 330, 484, 682, 1100, 1496, 1980, ...

31, 62, 155, 217, 465, 682, 961, 1550, 2108, 2790, ...

50, 100, 250, 350, 750, 1100, 1550, 2500, 3400, 4500, ...

68, 136, 340, 476, 1020, 1496, 2108, 3400, 4624, 6120, ...

90, 180, 450, 630, 1350, 1980, 2790, 4500, 6120, 8100, ...

...

CROSSREFS

Cf. A337655, A337659, A337660, A337662.

Sequence in context: A239819 A110789 A125952 * A248127 A258253 A177244

Adjacent sequences: A337658 A337659 A337660 * A337662 A337663 A337664

KEYWORD

nonn,tabl

AUTHOR

N. J. A. Sloane, Oct 03 2020

STATUS

approved