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Search: id:A136568
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| A136568 |
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Irregular triangle read by rows: row n contains the distinct values (in numerical order) making up the non-zero exponents in the prime-factorization of n. (Row 1 = (0).). |
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2
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| 0, 1, 1, 2, 1, 1, 1, 3, 2, 1, 1, 1, 2, 1, 1, 1, 4, 1, 1, 2, 1, 1, 2, 1, 1, 1, 1, 3, 2, 1, 3, 1, 2, 1, 1, 1, 5, 1, 1, 1, 2, 1, 1, 1, 1, 3, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 4, 2, 1, 2
(list; graph; listen)
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OFFSET
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1,4
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COMMENT
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Row n, for n>=2, contains A071625(n) terms.
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LINKS
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Leroy Quet, Home Page (listed in lieu of email address)
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EXAMPLE
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4200 = 2^3 * 3^1 * 5^2 * 7^1. The exponents of the prime factorization are therefore 3,1,2,1. Therefore row 4200 is (1,2,3).
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CROSSREFS
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Cf. A071625, A136565.
Sequence in context: A072776 A077481 A086290 this_sequence A152157 A039961 A108299
Adjacent sequences: A136565 A136566 A136567 this_sequence A136569 A136570 A136571
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KEYWORD
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more,nonn,tabf
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AUTHOR
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Leroy Quet, Jan 07 2008
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