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Search: id:A064364
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| A064364 |
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Positive integers sorted by A001414(n), the sum of their prime divisors, as the major key and n as the minor key. |
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+0
3
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| 1, 2, 3, 4, 5, 6, 8, 9, 7, 10, 12, 15, 16, 18, 14, 20, 24, 27, 21, 25, 30, 32, 36, 11, 28, 40, 45, 48, 54, 35, 42, 50, 60, 64, 72, 81, 13, 22, 56, 63, 75, 80, 90, 96, 108, 33, 49, 70, 84, 100, 120, 128, 135, 144, 162, 26, 44, 105, 112, 125, 126, 150, 160, 180, 192, 216, 243
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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This is a permutation of the positive integers.
a(1) could be taken as 0 because 1 is not a member of A001414, and one could start with a(0)=1 (see the W. Lang link).
The row length sequence of this array is A000607(n), n>=2.
If the array is [1,0,2,3,4,5,6,6,...] with offset 0 then the row length sequence is A000607(n), n>=0.
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LINKS
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Index entries for sequences that are permutations of the natural numbers
W. Lang: First 16 rows.
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CROSSREFS
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Cf. A001414.
Cf. A000607 (row lengths), A002098 (row sums), A056240 (least term in the n-th row), A000792 (greatest term in the n-th row).
Sequence in context: A125624 A003965 A097502 this_sequence A004726 A129618 A038673
Adjacent sequences: A064361 A064362 A064363 this_sequence A064365 A064366 A064367
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KEYWORD
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easy,nonn,tabf
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AUTHOR
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Howard A. Landman (howard(AT)polyamory.org), Sep 25 2001
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EXTENSIONS
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More terms from Vladeta Jovovic (vladeta(AT)Eunet.yu), Sep 27 2005
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