Numbers k such that 70*R_k + 3, where R_k = 11...1 is the repunit (A002275) of length k.
A056689
Numbers k such that 70*R_k + 3, where R_k = 11...1 is the repunit (A002275) of length k.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =4a(4) =8a(5) =11a(6) =14a(7) =20a(8) =263a(9) =382a(10) =2719a(11) =4493a(12) =21166a(13) =45824a(14) =55850a(15) =64567a(16) =70726
External references
- oeis: A056689