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 A008329 Number of divisors of p+1, p prime. 13
 2, 3, 4, 4, 6, 4, 6, 6, 8, 8, 6, 4, 8, 6, 10, 8, 12, 4, 6, 12, 4, 10, 12, 12, 6, 8, 8, 12, 8, 8, 8, 12, 8, 12, 12, 8, 4, 6, 16, 8, 18, 8, 14, 4, 12, 12, 6, 12, 12, 8, 12, 20, 6, 18, 8, 16, 16, 10, 4, 8, 6, 12, 12, 16, 4, 8, 6, 6, 12, 12, 8, 24, 10, 8, 12, 16, 16, 4, 8, 8, 24, 4, 20, 8, 16 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..2000 FORMULA a(n) = A000005(A008864(n)). - Sean A. Irvine, Mar 25 2018 MAPLE for i from 1 to 500 do if isprime(i) then print(tau(i+1)); fi; od; A008329 := proc(n)         numtheory[tau](ithprime(n)+1) ; end proc: # R. J. Mathar, Oct 30 2015 MATHEMATICA DivisorSigma[0, #]&/@(Prime[Range[100]]+1)  (* Harvey P. Dale, Apr 12 2011 *) PROG (PARI) a(n) = numdiv(prime(n)+1); \\ Michel Marcus, Mar 25 2018 (MAGMA) [NumberOfDivisors(NthPrime(n)+1): n in [1..100]]; // Vincenzo Librandi, Mar 25 2018 CROSSREFS Cf. A000005, A008864. Sequence in context: A036805 A036804 A180046 * A064558 A178031 A008328 Adjacent sequences:  A008326 A008327 A008328 * A008330 A008331 A008332 KEYWORD nonn AUTHOR EXTENSIONS Offset corrected by Leroy Quet, Oct 08 2008 STATUS approved

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Last modified July 18 21:23 EDT 2018. Contains 312765 sequences. (Running on oeis4.)