7874496

Appears in sequences

• Smallest triangular number with n prime factors (counted with multiplicity).at n=13A075088
• Triangular numbers with a triangular number of divisors which set a new record for number of divisors.at n=6A076172
• a(n) = Sum_{d|n} Moebius(n/d)*d^(b-1)/phi(n) for b = 7.at n=19A160895
• Let T(n) = n(n+1)/2 be the n-th triangular number (A000217); a(n) = T(8T(n)).at n=31A185096
• Triangular numbers that are the product of a triangular number and a square number (both greater than 1).at n=33A253650