1313131313

Appears in sequences

• Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 1,3.at n=9A037582
• a(n) = smallest multiple of the n-th prime whose decimal expansion is nnn...n, or 0 if no such number exists.at n=12A078251
• a(n) = 13*(100^(n+1) - 1)/99.at n=4A156641