A026820 - OEIS

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A026820 as a triangular array

1

1 2

1 2 3

1 3 4 5

1 3 5 6 7

1 4 7 9 10 11

1 4 8 11 13 14 15

1 5 10 15 18 20 21 22

1 5 12 18 23 26 28 29 30

1 6 14 23 30 35 38 40 41 42

1 6 16 27 37 44 49 52 54 55 56

1 7 19 34 47 58 65 70 73 75 76 77

A026820 as a square array

`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`
`2`	`2`	`3`	`3`	`4`	`4`	`5`	`5`	`6`	`6`	`7`
`3`	`4`	`5`	`7`	`8`	`10`	`12`	`14`	`16`	`19`
`5`	`6`	`9`	`11`	`15`	`18`	`23`	`27`	`34`
`7`	`10`	`13`	`18`	`23`	`30`	`37`	`47`
`11`	`14`	`20`	`26`	`35`	`44`	`58`
`15`	`21`	`28`	`38`	`49`	`65`
`22`	`29`	`40`	`52`	`70`
`30`	`41`	`54`	`73`
`42`	`55`	`75`
`56`	`76`
`77`

A026820 as an upper right triangle

`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`	`1`
	`2`	`2`	`3`	`3`	`4`	`4`	`5`	`5`	`6`	`6`	`7`
		`3`	`4`	`5`	`7`	`8`	`10`	`12`	`14`	`16`	`19`
			`5`	`6`	`9`	`11`	`15`	`18`	`23`	`27`	`34`
				`7`	`10`	`13`	`18`	`23`	`30`	`37`	`47`
					`11`	`14`	`20`	`26`	`35`	`44`	`58`
						`15`	`21`	`28`	`38`	`49`	`65`
							`22`	`29`	`40`	`52`	`70`
								`30`	`41`	`54`	`73`
									`42`	`55`	`75`
										`56`	`76`
											`77`

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Last modified April 16 10:45 EDT 2024. Contains 371709 sequences. (Running on oeis4.)