OFFSET
0,2
LINKS
Jinyuan Wang, Table of n, a(n) for n = 0..78
EXAMPLE
The 549755813888th = (2^39)th prime is 16149760533341, whose binary order is 44: it is ceiling(43.87657801)=44, so a(39)=44;
a(0)=1 is the binary order of the (2^0)th = 1st prime (= 2), which is log_2(2) = 1.
PROG
(PARI) a(n) = ceil(log(prime(2^n))/log(2)); \\ Michel Marcus, Aug 07 2021
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
a(40)-a(57) from Michel Marcus, Aug 25 2019
More terms from Jinyuan Wang, Aug 07 2021
STATUS
approved