A003991 - OEIS

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A003991 as a triangular array

1

2 2

3 4 3

4 6 6 4

5 8 9 8 5

6 10 12 12 10 6

7 12 15 16 15 12 7

8 14 18 20 20 18 14 8

9 16 21 24 25 24 21 16 9

10 18 24 28 30 30 28 24 18 10

11 20 27 32 35 36 35 32 27 20 11

12 22 30 36 40 42 42 40 36 30 22 12

A003991 as a square array

`1`	`2`	`3`	`4`	`5`	`6`	`7`	`8`	`9`	`10`	`11`	`12`
`2`	`4`	`6`	`8`	`10`	`12`	`14`	`16`	`18`	`20`	`22`
`3`	`6`	`9`	`12`	`15`	`18`	`21`	`24`	`27`	`30`
`4`	`8`	`12`	`16`	`20`	`24`	`28`	`32`	`36`
`5`	`10`	`15`	`20`	`25`	`30`	`35`	`40`
`6`	`12`	`18`	`24`	`30`	`36`	`42`
`7`	`14`	`21`	`28`	`35`	`42`
`8`	`16`	`24`	`32`	`40`
`9`	`18`	`27`	`36`
`10`	`20`	`30`
`11`	`22`
`12`

A003991 as an upper right triangle

`1`	`2`	`3`	`4`	`5`	`6`	`7`	`8`	`9`	`10`	`11`	`12`
	`2`	`4`	`6`	`8`	`10`	`12`	`14`	`16`	`18`	`20`	`22`
		`3`	`6`	`9`	`12`	`15`	`18`	`21`	`24`	`27`	`30`
			`4`	`8`	`12`	`16`	`20`	`24`	`28`	`32`	`36`
				`5`	`10`	`15`	`20`	`25`	`30`	`35`	`40`
					`6`	`12`	`18`	`24`	`30`	`36`	`42`
						`7`	`14`	`21`	`28`	`35`	`42`
							`8`	`16`	`24`	`32`	`40`
								`9`	`18`	`27`	`36`
									`10`	`20`	`30`
										`11`	`22`
											`12`

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Last modified April 20 04:36 EDT 2024. Contains 371798 sequences. (Running on oeis4.)