A066227 Number of digits in Mersenne primes with a prime number of digits.
2, 3, 19, 157, 2917
Offset: 1
Examples
a(4) is M21, the 21st Mersenne prime with prime digit count of 2917
Crossrefs
Cf. A028335.
This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.