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Search: id:A057950
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| A057950 |
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Numbers with more than one primitive factorization into S-primes. See related sequences for definition. |
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4
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| 441, 693, 1089, 1197, 1449, 1617, 1881, 1953, 2277, 2541, 2709, 2793, 2961, 3069, 3249, 3381, 3717, 3933, 4221, 4257, 4389, 4473, 4557, 4653, 4761, 4977, 5229, 5301, 5313, 5841, 5929, 6321, 6417, 6489, 6633, 6741, 6897, 6909, 7029, 7161, 7353, 7581
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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A subset of A057949, removing terms that are a multiple of a smaller term.
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EXAMPLE
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441 is in S = {1, 5, 9, ... 4i+1, ...}, 441 = 9*49 = 21^2, 9, 21, and 49 as S-primes (A057948). 441 is primitive because it is not divisible by any smaller numbers with more than 1 factorization into S-primes. Multiples of 441 within S are not primitive.
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CROSSREFS
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Cf. A054520, A057948, A057949.
Sequence in context: A061626 A124170 A057949 this_sequence A014793 A110996 A013769
Adjacent sequences: A057947 A057948 A057949 this_sequence A057951 A057952 A057953
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KEYWORD
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nonn
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AUTHOR
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Jud McCranie (j.mccranie(AT)comcast.net), Oct 14 2000
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