17181920

Appears in sequences

• Partition the concatenation 1234567...of natural numbers into successive strings nontrivially (a(n) is not equal to n) such that the n-th string is a multiple of n.at n=6A077293
• Partition the concatenation 1234567...of natural numbers into successive strings which are multiples of 4, all different and > 4. (0 never taken as the most significant digit.)at n=4A077297
• Smallest multiple of n that is a concatenation of (increasing) natural numbers starting with(n+1).at n=15A077310
• Multiples of 4 that are the concatenation of 4 consecutive natural numbers.at n=3A082242
• Duplicate of A077293.at n=6A088596
• a(1) = 1, a(n) = least proper multiple of a(n-1) which is a concatenation of successive numbers. Terms with more than one digit must be a concatenation of at least two successive numbers.at n=6A094333
• Numbers whose decimal expansion is a concatenation of 4 consecutive increasing nonnegative numbers.at n=16A279204