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Search: id:A058012
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| A058012 |
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Consider the sequence {b(m)} of composite numbers (excluding 1); sequence gives values of m where gcd{m, b(m)} increases. |
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+0
2
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| 4, 6, 10, 12, 14, 36, 39, 42, 45, 48, 124, 128, 132, 140, 345, 365, 370, 375, 380, 385, 390, 1086, 1140, 3101, 3122, 8416, 8480, 24309, 24318, 64550, 64560, 64570, 64590, 64600, 64660, 64730, 175208, 175219, 175230, 176616, 480876, 480888, 480948
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(4) = 12 because twelve is the sixth composite number and the GCD(6,12) > GCD(5,10).
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MATHEMATICA
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r=0; Do[a = GCD[n, n - PrimePi[n] -1]; If[a > r, r = a; Print[n]], {n, 1, 10^6} ]
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CROSSREFS
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Cf. A058011.
Sequence in context: A026402 A036438 A066190 this_sequence A026411 A020189 A166986
Adjacent sequences: A058009 A058010 A058011 this_sequence A058013 A058014 A058015
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KEYWORD
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nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Nov 13 2000
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