1,3

For large n, the average value of a(n) is about 4. See A138290 for the n such that a(n)=0. - TR. D. Noe, Mar 14 2008

T. D. Noe, Table of n, a(n) for n=1..2048

A. Karttunen and J. Moyer, C-program for computing the initial terms of this sequence

Index entries for sequences related to occurrences of various subsets of primes in range ]2^n,2^(n+1)]

Cf. A095018.

Sequence in context: A035143 A035173 A095201 this_sequence A137345 A060755 A104594

Adjacent sequences: A095055 A095056 A095057 this_sequence A095059 A095060 A095061

nonn

Antti Karttunen (his-firstname.his-surname(AT)iki.fi), Jun 01 2004