198765

Appears in sequences

• Doubly triangular numbers: a(n) = n*(n+1)*(n^2+n+2)/8.at n=35A002817
• Number of points in Z^10 of norm <= n.at n=3A055416
• Number of points in Z^n of norm <= 3.at n=10A055427
• Triangular numbers containing 2k digits in which the sum of the first k digits = that of the rest.at n=15A068898
• Triangular numbers for which the sum of the digits is a square.at n=30A117404
• Number of ways to choose two points on a centered hexagonal grid of size n.at n=14A241219
• Triangular numbers which have one or more occurrences of exactly six different digits.at n=26A241789
• Triangular numbers t(n) with a zeroless decimal representation such that (product of decimal digits of t(n)) / n is an integer.at n=7A307812
• Number of integer solutions to (x_1)^2 + (x_2)^2 + ... + (x_10)^2 <= n.at n=9A341399