166176

Appears in sequences

• a(n) = (n^2-1)*(2*n^2-1).at n=17A033595
• a(n) = n^2*(n^2 + 1)/2.at n=24A037270
• E.g.f. A(x) is inverse to F(x) = x*exp(-x)/(1+x).at n=6A052885
• Triangular numbers which are 8-almost primes.at n=18A076582
• Sum of next n numbers/n if n divides the sum else n times the sum of next n numbers.at n=23A094260
• Triangular numbers for which the number of divisors is also a triangular number.at n=33A116541
• Triangular numbers composed of digits {1,6,7}.at n=10A119140
• Numbers k such that the symmetric representation of sigma(k) has only two parts and they meet at the center of the Dyck path.at n=28A262259
• Refactorable triangular numbers.at n=29A272524
• Triangular numbers that are sum of squares of two distinct triangular numbers.at n=29A346386