OFFSET
1,3
COMMENTS
a(n) = Difference between the number of primes occurring in range [prime(n)*prime(n+1), prime(n+1)^2] and the number of primes occurring in range [prime(n)^2, prime(n)*prime(n+1)].
In other words, a(n) tells how many more primes there are in the latter part of the range prime(n)^2 .. prime(n+1)^2 (after the geometric mean of its limits), than in its first part (before the geometric mean of its limits).
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..6541
A. Karttunen, Sequences A256470 and A050216 compared with OEIS Plot2-script (See also the ratio-plots linked in A256468.)
CROSSREFS
KEYWORD
sign
AUTHOR
Antti Karttunen, Mar 30 2015
STATUS
approved