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 A101174 Triangle formed by grouping the natural numbers so that the n-th row contains n numbers whose product has exactly n prime divisors, minimizing (1) final term of row and (2) product of terms of row. 5
 2, 3, 4, 1, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 15, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 45, 48, 44, 46, 47, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Variation of A077172. LINKS EXAMPLE Triangle begins: 2 3,4 1,5,6 7,8,9,10 11,12,13,14,16 15,17,18,19,20,21 22,23,24,25,26,27,28 29,30,31,32,33,34,35,36 37,38,39,40,41,42,43,45,48 44,46,47,49,50,51,52,53,54,55 56,57,58,59,60,61,62,63,64,65,66 67,68,69,70,71,72,73,74,75,76,77,80 78,79,81,82,83,84,85,86,87,88,89,90,91 CROSSREFS Cf. A101175, A101176, A101177, A101178, A101179. Cf. A093451. Sequence in context: A067003 A277884 A117386 * A050144 A124406 A225650 Adjacent sequences: A101171 A101172 A101173 * A101175 A101176 A101177 KEYWORD nonn,tabl AUTHOR Ray Chandler, Dec 03 2004 STATUS approved

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Last modified December 8 22:05 EST 2022. Contains 358698 sequences. (Running on oeis4.)