%I
%S 0,1,1,0,2,0,2,0,0,0,3,0,3,0,0,0,4,0,4,0,0,0,4,0,0,0,0,0,4,0,4,0,0,0,
%T 0,0,5,0,0,0,5,0,5,0,0,0,5,0,0,0,0,0,5,0,0,0,0,0,5,0,5,0,0,0,0,0,5,0,
%U 0,0,5,0,5,0,0,0,0,0,5,0,0,0,6,0,0,0,0,0,6,0,0,0,0,0,0,0,6,0,0,0,6,0,6,0,0
%N Variation on A029834: a discrete version of the Mangoldt function. If n is prime then floor(log(prime(n)) else 0.
%H Antti Karttunen, <a href="/A062590/b062590.txt">Table of n, a(n) for n = 1..10000</a>
%F a(n) = delta(tau(n), 2) * floor(log(prime(n)) = A010051(n) * A029835(n), where delta is the Kronecker delta function and tau is the number of divisors function.  _Alonso del Arte_, Sep 11 2013
%e a(5) = 2 because the fifth prime is 11, the logarithm of which is 2.397895...
%e a(6) = 0 because 6 is not prime.
%e a(7) = 2 because the seventh prime is 17, the logarithm of which is 2.833213344...
%t Table[Boole[PrimeQ[n]] Floor[Log[Prime[n]]], {n, 105}] (* _Alonso del Arte_, Sep 07 2013 *)
%o (PARI) v=[]; for(n=1,150,v=concat(v, if(isprime(n),floor(log(prime(n))),))); v
%Y Cf. A029834.
%K nonn
%O 1,5
%A _Jason Earls_, Jul 03 2001
