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A163523
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a(n) = tau(n) + omega(n).
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2
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1, 3, 3, 4, 3, 6, 3, 5, 4, 6, 3, 8, 3, 6, 6, 6, 3, 8, 3, 8, 6, 6, 3, 10, 4, 6, 5, 8, 3, 11, 3, 7, 6, 6, 6, 11, 3, 6, 6, 10, 3, 11, 3, 8, 8, 6, 3, 12, 4, 8, 6, 8, 3, 10, 6, 10, 6, 6, 3, 15, 3, 6, 8, 8, 6, 11, 3, 8, 6, 11, 3, 14, 3, 6, 8, 8, 6, 11, 3, 12, 6, 6, 3, 15, 6, 6, 6, 10, 3, 15, 6, 8, 6, 6, 6, 14
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OFFSET
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1,2
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COMMENTS
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Here tau(n) is the number of divisors of n (A000005) and omega(n) is the number distinct primes dividing n (A001221).
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LINKS
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FORMULA
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MAPLE
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MATHEMATICA
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Array[DivisorSigma[0, #]+PrimeNu[#]&, 100] (* Harvey P. Dale, Dec 03 2011 *)
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PROG
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(PARI) for(n=1, 50, print1(numdiv(n) + omega(n), ", ")) \\ G. C. Greubel, May 16 2017
(Magma) [#PrimeDivisors(n)+NumberOfDivisors(n): n in [1..100]]; // Vincenzo Librandi, May 17 2017
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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