121212121212
domain: N
Appears in sequences
- Two-bell analog of A028355.at n=17A028359
- Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 1,2.at n=11A037487
- Smallest n-digit multiple of n in which the even-numbered digits are all equal and the odd-numbered digits are all equal, or 0 if no such number exists.at n=11A078252
- a(n) is the smallest number not already present that permits the cyclic repetition of the path 1,2 of the digits in the sequence.at n=22A165300
- a(n) = a(n-1) + 12*100^(n-1), with a(0)=0.at n=6A177090