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A035004
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Number of divisors of the n-th nonprime.
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10
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1, 3, 4, 4, 3, 4, 6, 4, 4, 5, 6, 6, 4, 4, 8, 3, 4, 4, 6, 8, 6, 4, 4, 4, 9, 4, 4, 8, 8, 6, 6, 4, 10, 3, 6, 4, 6, 8, 4, 8, 4, 4, 12, 4, 6, 7, 4, 8, 6, 4, 8, 12, 4, 6, 6, 4, 8, 10, 5, 4, 12, 4, 4, 4, 8, 12, 4, 6, 4, 4, 4, 12, 6, 6, 9, 8, 8, 8, 4, 12, 8, 4, 10, 8, 4, 6, 6, 4, 4, 16, 3, 4, 4, 6, 4, 12, 8, 4
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OFFSET
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1,2
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COMMENTS
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a(n+1) = a(n) only when a(n) is even. Will these repeat terms include each even integer >= 4? (See also A075036.) - Bill McEachen, Nov 16 2021
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LINKS
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FORMULA
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MATHEMATICA
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DivisorSigma[0, Select[Range[200], !PrimeQ[#]&]] (* Harvey P. Dale, Mar 07 2016 *)
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PROG
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(PARI) for(n=1, 33, if(!isprime(n), print1(numdiv(n), ", "))) \\ edited by Michel Marcus, Jan 04 2016
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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