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Search: id:A134000
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| A134000 |
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Array read by anti-diagonals: row n contains the positive integers each with exactly n positive "non-isolated divisors". A divisor, k, of n is non-isolated if (k-1) or (k+1) also divides n. |
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+0
2
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| 2, 6, 4, 12, 18, 8, 30, 20, 54, 10, 60, 42, 24, 66, 14, 90, 72, 126, 36, 78, 16, 180, 168, 84, 150, 40, 102, 22, 360, 210, 270, 120, 294, 48, 114, 26, 630, 660, 240, 330, 132, 306, 56, 138, 28, 420, 924, 1080, 480, 336, 144, 342, 80, 162, 32, 840, 720, 1200, 1092, 504
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OFFSET
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2,1
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COMMENT
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The left column (column 1) of the array is sequence A133996. This array written as a sequence is a permutation of the even positive integers. The array starts at column 1 and row 2. (There are no integers with exactly 1 non-isolated divisor.)
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EXAMPLE
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2 non-isolated divisors: 2, 4, 8,10,14,...
3 non-isolated divisors: 6,18,54,66,...
4 non-isolated divisors: 12,20,24,...
etc.
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CROSSREFS
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Cf. A134001, A133996.
Sequence in context: A145177 A007517 A072946 this_sequence A127730 A118416 A046204
Adjacent sequences: A133997 A133998 A133999 this_sequence A134001 A134002 A134003
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KEYWORD
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nonn,tabl
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AUTHOR
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Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Oct 01 2007
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EXTENSIONS
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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jun 25 2008
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