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Search: id:A114380
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| A114380 |
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Largest prime (or prime power) that divides any number between the primes p(n) and p(n+1). |
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+0
1
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| 4, 3, 9, 4, 16, 9, 11, 27, 5, 32, 19, 7, 23, 49, 29, 5, 64, 23, 9, 37, 81, 43, 47, 49, 17, 53, 27, 37, 125, 128, 67, 23, 73, 25, 31, 81, 83, 169, 89, 9, 61, 64, 97, 11, 103, 109, 113, 19, 29, 79, 16, 243, 256, 131, 89, 27, 137, 139, 47, 289
(list; graph; listen)
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OFFSET
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2,1
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EXAMPLE
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a(4) = 9 because, of the numbers between 7 (= p(4)) and 11 (= p(5)), 9 has the largest prime, or prime-to-a-power, divisor (namely, itself). a(13) = 7 because only 42 lies between 41 (= p(13)) and 43 (= p(14)) and its largest prime divisor is 7.
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CROSSREFS
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Sequence in context: A074123 A016704 A131896 this_sequence A103825 A073238 A010655
Adjacent sequences: A114377 A114378 A114379 this_sequence A114381 A114382 A114383
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KEYWORD
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easy,nonn
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AUTHOR
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Greg Huber (huber(AT)alum.mit.edu), Feb 10 2006
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EXTENSIONS
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More terms from Joseph Pedersen (jmp456(AT)psu.edu), Apr 27 2006
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