1,2

Conjecture: The difference between successive terms is between 2 and 3.

Table of n, a(n) for n=1..64.

Li(n) is the logarithmic integral which approximates the number of primes less than n. n Li(n) = Int dt/log(t) 2

(PARI) for(x=1, 100, print1(floor(10.^x/Li(10^x)-1)", ")) Li(x) = \ Logarithmic integral { -eint1(log(1/x)) }

Sequence in context: A020904 A043000 A160822 * A187686 A024812 A047349

Adjacent sequences: A111492 A111493 A111494 * A111496 A111497 A111498

easy,nonn

Cino Hilliard, Nov 15 2005

approved