1,1

The next entry is greater than 2^44 as 2^45 exceeds The Nth Prime Page.

Table of n, a(n) for n=1..6.

(PARI) primeslessxn2(n, p) = \primes < p^n if prime { sr=0; for(x=0, n, y=pi(p^x); if(y<>0, sr+=1.0/y); if(isprime(y), print1(y", ")); ); print(); print(sr) }

Sequence in context: A106847 A092761 A296733 * A190259 A190261 A000755

Adjacent sequences: A087930 A087931 A087932 * A087934 A087935 A087936

nonn

Cino Hilliard, Oct 27 2003

approved