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Search: id:A087112
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| A087112 |
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Triangle in which the n-th row contains n distinct semiprimes not listed previously with all prime factors from among the first n primes. |
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+0
6
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| 4, 6, 9, 10, 15, 25, 14, 21, 35, 49, 22, 33, 55, 77, 121, 26, 39, 65, 91, 143, 169, 34, 51, 85, 119, 187, 221, 289, 38, 57, 95, 133, 209, 247, 323, 361, 46, 69, 115, 161, 253, 299, 391, 437, 529, 58, 87, 145, 203, 319, 377, 493, 551, 667, 841, 62, 93, 155, 217, 341
(list; table; graph; listen)
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OFFSET
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1,1
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COMMENT
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Terms through row n, sorted, will provide terms for A077553 through row n*(n+1)/2.
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FORMULA
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The n-th row consists of n terms, prime(n)*prime(i), i=1, n.
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EXAMPLE
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4;
6,9;
10,15,25;
14,21,35,49;
22,33,55,77,121;
26,39,65,91,143,169;
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CROSSREFS
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Sequence in context: A122492 A133234 A111206 this_sequence A077554 A118778 A108635
Adjacent sequences: A087109 A087110 A087111 this_sequence A087113 A087114 A087115
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KEYWORD
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nonn,tabl
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AUTHOR
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Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 21 2003
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