A278505 - OEIS

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A278505 as a triangular array

												1
											2		3
										4		5		7
									6		11		9		13
								8		17		21		15		19
							10		23		33		37		25		27
						12		29		45		55		51		31		39
					14		35		57		75		85		73		43		49
				16		41		69		97		111		121		99		61		63
			18		47		81		115		145		159		151		127		67		79
		20		53		93		135		171		199		211		193		163		87		91
	22		59		105		157		205		243		267		271		247		187		103		109

A278505 as a square array

1	2	4	6	8	10	12	14	16	18	20	22
3	5	11	17	23	29	35	41	47	53	59
7	9	21	33	45	57	69	81	93	105
13	15	37	55	75	97	115	135	157
19	25	51	85	111	145	171	205
27	31	73	121	159	199	243
39	43	99	151	211	267
49	61	127	193	271
63	67	163	247
79	87	187
91	103
109

A278505 as an upper right triangle

1	2	4	6	8	10	12	14	16	18	20	22
	3	5	11	17	23	29	35	41	47	53	59
		7	9	21	33	45	57	69	81	93	105
			13	15	37	55	75	97	115	135	157
				19	25	51	85	111	145	171	205
					27	31	73	121	159	199	243
						39	43	99	151	211	267
							49	61	127	193	271
								63	67	163	247
									79	87	187
										91	103
											109