73515

Appears in sequences

• a(n) = n*(n+1)*(6*n-5)/2.at n=29A172082
• Preperiod (or threshold) of orbit of Post's {00, 1101} tag system applied to the word (100)^n, or -1 if this word has an unbounded trajectory.at n=43A284119
• Zeroless numbers n = concat(s,t) such that s * t is the 10's complement of the digits of n.at n=10A286353