349866

Appears in sequences

• Triangular numbers that are 6 times other triangular numbers.at n=6A077290
• Triangular numbers t such that all the digits needed to write the consecutive triangular numbers from 0 to t fill exactly an equilateral triangle (no holes, no overlaps).at n=36A158030
• Triangular numbers that are the product of two triangular numbers greater than 1.at n=38A188630
• Coefficient of x in the reduction by x^2->x+2 of the polynomial p(n,x)=1+x^n+x^(2n).at n=9A192466
• Triangular numbers that are the product of a triangular number and an oblong number.at n=37A253652
• Triangular numbers n such that sigma(n) is a square number.at n=22A256151
• Numbers which are cyclops palindromic in their binary reflected Gray code representation.at n=9A279260
• Triangular numbers that can be represented as a sum of two distinct triangular numbers, and as a product of two triangular numbers greater than 1.at n=18A295768
• Number of oriented rational links with crossing number n.at n=19A329908
• Smallest m > 0 such that the triangular number m*(m+1)/2 is divisible by 2^n-1.at n=29A343995