OFFSET
0,1
EXAMPLE
There are 4 Mersenne prime exponents between 10^0 and 10^1; 6 between 10^1 and 10^2; ... . There are 9 known Mersenne primes between 10^7 and 10^8 so for now, the next entry is 9.
CROSSREFS
KEYWORD
nonn,hard
AUTHOR
Marvin Ray Burns, Jun 18 2000; updated Jan 07 2006, Jan 15 2009
STATUS
approved