A138609 - OEIS

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A138609 as a triangular array

1

3 4

2 5 6

7 8 11 12

9 10 13 14 17

15 16 19 20 23 24

18 21 22 25 26 29 30

27 28 31 32 35 36 39 40

33 34 37 38 41 42 45 46 49

43 44 47 48 51 52 55 56 59 60

50 53 54 57 58 61 62 65 66 69 70

63 64 67 68 71 72

A138609 as a square array

`1`	`3`	`2`	`7`	`9`	`15`	`18`	`27`	`33`	`43`	`50`	`63`
`4`	`5`	`8`	`10`	`16`	`21`	`28`	`34`	`44`	`53`	`64`
`6`	`11`	`13`	`19`	`22`	`31`	`37`	`47`	`54`	`67`
`12`	`14`	`20`	`25`	`32`	`38`	`48`	`57`	`68`
`17`	`23`	`26`	`35`	`41`	`51`	`58`	`71`
`24`	`29`	`36`	`42`	`52`	`61`	`72`
`30`	`39`	`45`	`55`	`62`
`40`	`46`	`56`	`65`
`49`	`59`	`66`
`60`	`69`
`70`

A138609 as an upper right triangle

`1`	`3`	`2`	`7`	`9`	`15`	`18`	`27`	`33`	`43`	`50`	`63`
	`4`	`5`	`8`	`10`	`16`	`21`	`28`	`34`	`44`	`53`	`64`
		`6`	`11`	`13`	`19`	`22`	`31`	`37`	`47`	`54`	`67`
			`12`	`14`	`20`	`25`	`32`	`38`	`48`	`57`	`68`
				`17`	`23`	`26`	`35`	`41`	`51`	`58`	`71`
					`24`	`29`	`36`	`42`	`52`	`61`	`72`
						`30`	`39`	`45`	`55`	`62`
							`40`	`46`	`56`	`65`
								`49`	`59`	`66`
									`60`	`69`
										`70`

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Last modified August 24 18:44 EDT 2024. Contains 375417 sequences. (Running on oeis4.)