Smallest number k for which k, 2k, ... nk all contain the digit 1.

Terms

a(0) =1a(1) =51a(2) =51a(3) =531a(4) =2571a(5) =2571a(6) =2571a(7) =15703a(8) =15703a(9) =15703a(10) =15703a(11) =15703a(12) =15703a(13) =15703a(14) =90271a(15) =90271a(16) =90271a(17) =90271a(18) =90271a(19) =90271a(20) =90271a(21) =90271a(22) =102053a(23) =530102a(24) =530102a(25) =530102a(26) =530102a(27) =530102a(28) =530102a(29) =530102