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 A035004 Number of divisors of the n-th nonprime. 10
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS 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 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 FORMULA a(n) = A000005(A018252(n)). - Omar E. Pol, Jan 31 2013 MATHEMATICA DivisorSigma[0, Select[Range[200], !PrimeQ[#]&]] (* Harvey P. Dale, Mar 07 2016 *) PROG (PARI) for(n=1, 33, if(!isprime(n), print1(numdiv(n), ", "))) \\ edited by Michel Marcus, Jan 04 2016 CROSSREFS Cf. A000005, A002808, A018252, A075036. Sequence in context: A253718 A350188 A295570 * A222290 A222430 A222275 Adjacent sequences: A035001 A035002 A035003 * A035005 A035006 A035007 KEYWORD easy,nonn AUTHOR Jason Earls, Jul 05 2001 EXTENSIONS More terms from Lior Manor, Aug 16 2001 STATUS approved

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Last modified April 14 03:22 EDT 2024. Contains 371652 sequences. (Running on oeis4.)