3454506

Appears in sequences

• Smallest number which is the sum of two positive triangular numbers in exactly n different ways.at n=23A052346
• Triangular numbers m such that A040115(m) is also triangular.at n=37A087597
• a(n) = A185128(n) + A185129(n).at n=23A185243
• Number of 5Xn 0..1 arrays with every element equal to 0, 1, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=14A302638
• a(n) is the smallest nonnegative integer that can be written as a sum of two distinct nonzero triangular numbers in exactly n ways or -1 if no such integer exists.at n=23A342326
• Triangular numbers T(i) that can be expressed as the sum of 2 positive triangular numbers, T(j)+T(k), and for which i+j+k is a triangular number, where T is A000217.at n=27A343426