OFFSET
1,3
LINKS
EXAMPLE
In the range ]2^4,2^5] 17 (10001 in binary) is the only such prime thus a(2) = 1.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Antti Karttunen, Jun 01 2004
EXTENSIONS
a(17)-a(20) from Amiram Eldar, Jun 13 2024
STATUS
approved