A081493 - OEIS

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A081493 as a triangular array

												1
											2		3
										3		5		7
									4		7		10		13
								5		9		13		17		21
							6		11		16		21		26		31
						7		13		19		25		31		37		43
					8		15		22		29		36		43		50		57
				9		17		25		33		41		49		57		65		73
			10		19		28		37		46		55		64		73		82		91
		11		21		31		41		51		61		71		81		91		101		111
	12		23		34		45		56		67		78		89

A081493 as a square array

1	2	3	4	5	6	7	8	9	10	11	12
3	5	7	9	11	13	15	17	19	21	23
7	10	13	16	19	22	25	28	31	34
13	17	21	25	29	33	37	41	45
21	26	31	36	41	46	51	56
31	37	43	49	55	61	67
43	50	57	64	71	78
57	65	73	81	89
73	82	91
91	101
111

A081493 as an upper right triangle

1	2	3	4	5	6	7	8	9	10	11	12
	3	5	7	9	11	13	15	17	19	21	23
		7	10	13	16	19	22	25	28	31	34
			13	17	21	25	29	33	37	41	45
				21	26	31	36	41	46	51	56
					31	37	43	49	55	61	67
						43	50	57	64	71	78
							57	65	73	81	89
								73	82	91
									91	101
										111