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Search: id:A027748
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| A027748 |
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Triangle in which first row is 1, n-th row (n>1) lists distinct prime factors of n. |
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+0
9
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| 1, 2, 3, 2, 5, 2, 3, 7, 2, 3, 2, 5, 11, 2, 3, 13, 2, 7, 3, 5, 2, 17, 2, 3, 19, 2, 5, 3, 7, 2, 11, 23, 2, 3, 5, 2, 13, 3, 2, 7, 29, 2, 3, 5, 31, 2, 3, 11, 2, 17, 5, 7, 2, 3, 37, 2, 19, 3, 13, 2, 5, 41, 2, 3, 7, 43, 2, 11, 3, 5, 2, 23, 47, 2, 3, 7, 2, 5, 3, 17, 2, 13, 53, 2, 3, 5, 11, 2, 7, 3, 19, 2, 29, 59, 2, 3, 5, 61, 2, 31
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Number of terms in n-th row is A001221(n) for n>1.
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LINKS
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T. D. Noe, Rows n=1..2048 of triangle, flattened
Eric Weisstein's World of Mathematics, Distinct Prime Factors
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EXAMPLE
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{2}, {3}, {2}, {5}, {2, 3}, {7}, {2}, {3}, {2, 5}, {11},...
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MAPLE
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with(numtheory): [ seq(factorset(n), n=1..100) ];
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CROSSREFS
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Cf. A000027, A001221, A001222, A027746.
a(A013939(A000040(n))+1) = A000040(n).
Adjacent sequences: A027745 A027746 A027747 this_sequence A027749 A027750 A027751
Sequence in context: A129088 A086418 A100761 this_sequence A000705 A073751 A108501
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KEYWORD
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nonn,easy,tabf,nice
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AUTHOR
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njas
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EXTENSIONS
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More terms from Scott Lindhurst (ScottL(AT)alumni.princeton.edu)
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