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A066691
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Value of tau(2n-1) when tau(2n-1)=tau(2n+1).
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1
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2, 2, 2, 2, 2, 4, 2, 4, 2, 2, 4, 4, 4, 2, 2, 4, 2, 4, 4, 2, 4, 2, 4, 4, 2, 2, 4, 4, 4, 4, 4, 4, 2, 4, 2, 6, 4, 4, 2, 2, 4, 4, 4, 2, 4, 4, 4, 4, 4, 2, 4, 4, 4, 4, 4, 2, 6, 2, 4, 4, 2, 4, 4, 6, 4, 4, 2, 4, 4, 4, 4, 2, 4, 4, 4, 2, 6, 2, 4, 6, 2, 2, 8, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 4, 4, 2, 2, 6, 4, 2, 4, 2
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Harry J. Smith, Table of n, a(n) for n=1,...,1000
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PROG
| (PARI) for (n=2, 10000, if (numdiv(2*n-1) == numdiv(2*n+1), write1("tau=tau.txt", numdiv(2*n-1), ", ")))
(PARI) { n=0; for (m=1, 10^10, if ((d=numdiv(2*m-1)) == numdiv(2*m+1), write("b066691.txt", n++, " ", d); if (n==1000, return)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Mar 17 2010]
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CROSSREFS
| Sequence in context: A060594 A104361 A086876 * A164296 A064133 A160675
Adjacent sequences: A066688 A066689 A066690 * A066692 A066693 A066694
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KEYWORD
| nonn
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AUTHOR
| Jon Perry (perry(AT)globalnet.co.uk), Jan 11 2002
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EXTENSIONS
| OFFSET changed from 0,1 to 1,1 by Harry J. Smith (hjsmithh(AT)sbcglobal.net), Mar 17 2010
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