Repdigit numbers that are divisible by 7.

Terms

a(0) =0a(1) =7a(2) =77a(3) =777a(4) =7777a(5) =77777a(6) =111111a(7) =222222a(8) =333333a(9) =444444a(10) =555555a(11) =666666a(12) =777777a(13) =888888a(14) =999999a(15) =7777777a(16) =77777777a(17) =777777777a(18) =7777777777a(19) =77777777777a(20) =111111111111a(21) =222222222222a(22) =333333333333a(23) =444444444444a(24) =555555555555a(25) =666666666666a(26) =777777777777