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Search: id:A166401
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| A166401 |
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Positive integers n where (the largest divisor of n that is <= sqrt(n)) divides (the smallest divisor of n that is >= sqrt(n)). |
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3
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| 1, 2, 3, 4, 5, 7, 8, 9, 11, 13, 16, 17, 18, 19, 23, 25, 27, 29, 31, 32, 36, 37, 41, 43, 47, 49, 50
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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This sequence contains all the primes. For those terms that are composite, see A166402. For those terms that are not powers of primes, see A166403.
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EXAMPLE
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The divisors of 50 are 1,2,5,10,25,50. The middle two divisors are 5 and 10. Since 5 divides 10, then 50 is in this sequence.
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CROSSREFS
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Cf. A166402, A166403
Sequence in context: A087092 A046684 A082377 this_sequence A133811 A119314 A014567
Adjacent sequences: A166398 A166399 A166400 this_sequence A166402 A166403 A166404
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KEYWORD
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more,nonn
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AUTHOR
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Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Oct 13 2009
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