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Search: id:A066690
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| A066690 |
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Odd n such that tau(n)=tau(n+2)=10, where tau(n)=A000005(n) is the number of divisors of n. |
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+0
1
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| 127251, 649375, 1274373, 1303047, 2206519, 2388123, 2775625, 3400623, 3585625, 3627909, 4193125, 4294375, 4311873, 5707177, 6319375, 6336873, 6926875, 7128567, 7939375, 7949581, 8101537, 11280625, 11298123, 11786875
(list; graph; listen)
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OFFSET
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0,1
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MATHEMATICA
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Do[ If[ DivisorSigma[0, 2n - 1] == DivisorSigma[0, 2n + 1] == 10, Print[2n - 1]], {n, 1, 10^7} ]
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PROGRAM
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(PARI) for (n=1, 2000000, if ((numdiv(2*n-1)==10) && (numdiv(2*n+1)==10), write("tau=tau=10.txt", 2*n-1, "::", tau(2*n-1))))
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CROSSREFS
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Sequence in context: A048936 A133220 A023086 this_sequence A114668 A128038 A013893
Adjacent sequences: A066687 A066688 A066689 this_sequence A066691 A066692 A066693
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KEYWORD
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nonn
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AUTHOR
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Jon Perry (perry(AT)globalnet.co.uk), Jan 11 2002
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EXTENSIONS
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Edited by Dean Hickerson (dean(AT)math.ucdavis.edu), Jan 13, 2002.
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