A121266 - OEIS

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A121266 as a triangular array

											10
										11		11
									12		13		13
								13		15		16		16
							14		17		19		20		20
						15		19		22		24		25		25
					16		21		25		28		30		31		31
				17		23		28		32		35		37		38		38
			18		25		31		36		40		43		45		46		46
		19		27		34		40		45		49		52		54		55		55
	20		29		37		44		50		55		59		62		64		65		65

A121266 as a square array

10	11	12	13	14	15	16	17	18	19	20
11	13	15	17	19	21	23	25	27	29
13	16	19	22	25	28	31	34	37
16	20	24	28	32	36	40	44
20	25	30	35	40	45	50
25	31	37	43	49	55
31	38	45	52	59
38	46	54	62
46	55	64
55	65
65

A121266 as an upper right triangle

10	11	12	13	14	15	16	17	18	19	20
	11	13	15	17	19	21	23	25	27	29
		13	16	19	22	25	28	31	34	37
			16	20	24	28	32	36	40	44
				20	25	30	35	40	45	50
					25	31	37	43	49	55
						31	38	45	52	59
							38	46	54	62
								46	55	64
									55	65
										65