1,1

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).

Cf. A004022, A004023, A010785, A000668.

Sequence in context: A091689 A046482 A046941 this_sequence A114983 A118950 A092620

Adjacent sequences: A116689 A116690 A116691 this_sequence A116693 A116694 A116695

base,easy,nonn

Rick L. Shepherd (rshepherd2(AT)hotmail.com), Feb 22 2006