89517

Appears in sequences

• Numbers n such that the decimal representation of n is contained as substring in that of the n-th pentagonal number.at n=19A179782
• Numbers n=2*k-1 where Sum_{j=1..k} (-1)^(j+1) * d(2*j-1) achieves a new record, with d(n) = number of divisors of n (A000005).at n=27A318737