Primes in A010785 (repdigit numbers). Union of single-digit primes and A004022 (repunit primes). A004023 shows that the next term is 317 1's. The Mersenne primes (A000668) are the binary analogue (i.e., bits are all 1's).
Table of n, a(n) for n=1..7.
A004022 is a subsequence.
Cf. A004023, A010785, A000668.
Sequence in context: A091689 A046482 A046941 * A114983 A118950 A092620
Adjacent sequences: A116689 A116690 A116691 * A116693 A116694 A116695
Rick L. Shepherd, Feb 22 2006