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Search: id:A064354
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| A064354 |
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Distinct values arising in the sequence of LCM of the first n nonprime numbers. |
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+0
2
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| 1, 4, 12, 24, 72, 360, 2520, 5040, 55440, 277200, 3603600, 10810800, 21621600, 367567200, 6983776800, 160626866400, 1124388064800, 32607253879200, 1010824870255200, 2021649740510400, 74801040398884800, 224403121196654400
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,100
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EXAMPLE
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Different from A003418 and A051451.
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MATHEMATICA
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t=t=Select[ Range[ 1, 200 ], !PrimeQ[ # ] & ] Union[ Table[ Apply[ LCM, Table[ Part[ t, w ], {w, 1, s} ] ], {s, 1, 100} ] ]
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PROGRAM
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(PARI) { n=0; b=1; for (m=1, 10^9, if (m>1, if (isprime(m) || (b=lcm(a, m)) == a, next)); write("b064354.txt", n++, " ", a=b); if (n==100, break) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 12 2009]
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CROSSREFS
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A018252, A002808, A003418, A051451, A025543.
Sequence in context: A003203 A051193 A025543 this_sequence A073841 A140813 A032339
Adjacent sequences: A064351 A064352 A064353 this_sequence A064355 A064356 A064357
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Sep 25 2001
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EXTENSIONS
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a(22) from Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 12 2009
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