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A036337
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Largest integer with n digits and exactly n prime factors (counted with multiplicity).
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4
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7, 95, 994, 9999, 99996, 999992, 9999968, 99999840, 999999968, 9999999900, 99999999840, 999999999744, 9999999998720, 99999999998400, 999999999999000, 9999999999999744, 99999999999995904, 999999999999967232, 9999999999999989760, 99999999999999995904
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OFFSET
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1,1
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COMMENTS
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If all prime factors are distinct then a(n) >= A002110(n) which might give a contradiction for large enough n and so some primes have a multiplicity > k for some nonnegative k. - David A. Corneth, Oct 30 2018
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LINKS
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EXAMPLE
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95 = 5 * 19, while 96, 97, 98, 99 and 100 have, respectively, 6,1,3,3 and 4 prime factors; thus 95 is the largest two digit number with exactly two prime factors.
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MATHEMATICA
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Table[Module[{k=10^n-1}, While[PrimeOmega[k]!=n, k--]; k], {n, 20}] (* Harvey P. Dale, Sep 02 2022 *)
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PROG
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(PARI) a(n) = forstep(i = 10^n-1, 10^(n-1), -1, if(bigomega(i) == n, return(i))) \\ David A. Corneth, Oct 30 2018
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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