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Search: id:A083197
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| A083197 |
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Triangular array, read by rows, where if n is odd the n-th row consists of n least unused non-primes, while if n is even the n-th row consists of the n least unused primes. |
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+0
1
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| 1, 2, 3, 4, 6, 8, 5, 7, 11, 13, 9, 10, 12, 14, 15, 17, 19, 23, 29, 31, 37, 16, 18, 20, 21, 22, 24, 25, 41, 43, 47, 53, 59, 61, 67, 71, 26, 27, 28, 30, 32, 33, 34, 35, 36, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 51, 127, 131, 137
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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This sequence is a permutation of the natural numbers.
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EXAMPLE
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Triangle begins:
1
2 3
4 6 8
5 7 11 13
9 10 12 14 15
17 19 23 29 31 37
...
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CROSSREFS
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Sequence in context: A120817 A166310 A109852 this_sequence A038150 A082315 A082320
Adjacent sequences: A083194 A083195 A083196 this_sequence A083198 A083199 A083200
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KEYWORD
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nonn,tabl
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 27 2003
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EXTENSIONS
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Edited, corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jan 05 2009
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