1,3

Table of n, a(n) for n=1..16.

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)]

In range ]2^2,2^3] 5 (101 in binary) is only such prime thus a(1)=1 and similarly, in range ]2^4,2^5] 19 (10011 in binary) is also unique in that respect, thus a(2)=1 as well.

Cf. A095018.

Sequence in context: A041671 A215221 A203160 * A291279 A182379 A243544

Adjacent sequences: A095050 A095051 A095052 * A095054 A095055 A095056

nonn

Antti Karttunen, Jun 01 2004

approved