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A082287
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a(1) = 1; for n > 1, n appears omega(n) times, where omega(n)=A001221(n) is the number of distinct prime factors of n, a(1)=1.
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3
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1, 2, 3, 4, 5, 6, 6, 7, 8, 9, 10, 10, 11, 12, 12, 13, 14, 14, 15, 15, 16, 17, 18, 18, 19, 20, 20, 21, 21, 22, 22, 23, 24, 24, 25, 26, 26, 27, 28, 28, 29, 30, 30, 30, 31, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 38, 38, 39, 39, 40, 40, 41, 42, 42, 42, 43, 44, 44, 45, 45, 46, 46, 47
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OFFSET
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1,2
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COMMENTS
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LINKS
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FORMULA
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a(n) is the least k such that Sum_{p<=k} floor(k/p) >= n where p runs through the primes. - Benoit Cloitre, Nov 08 2009
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MATHEMATICA
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Join[{1}, Flatten[Table[PadRight[{}, PrimeNu[n], n], {n, 2, 50}]]] (* Harvey P. Dale, Jan 08 2020 *)
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PROG
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(PARI) a(n)=if(n<0, 0, t=1; while(sum(k=1, t, floor(t/prime(k)))<n, t++); t) \\ Benoit Cloitre, Nov 08 2009
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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