171897

Appears in sequences

• Numbers n such that n divides the (left) concatenation of all numbers <= n written in base 10 (most significant digit on right).at n=9A061963
• Triangle read by rows: the n-th row gives the least sequence of n consecutive numbers with the same number of divisors.at n=25A376557
• a(n) = Sum_{k=0..floor(n/3)} binomial(n+k-1,k) * binomial(n+2*k-1,n-3*k).at n=11A389378