104442

Appears in sequences

• Numbers k such that k*(k+1)/2 + 1 is a square.at n=13A006451
• Number of interior balls in a truncated octahedral arrangement.at n=18A093033
• a(n) = 2*a(n-1) + a(n-2) + 1, a(0) = 1, a(1) = 2.at n=13A098790
• Numbers k such that the distance between the k-th triangular number and the nearest square is at most 1.at n=25A229083
• Numbers k such that the distance between the k-th triangular number and the nearest square is exactly 1.at n=19A229131
• G.f.: 1/(1-x)^4 * Product_{k>=1} (1 + x^k).at n=24A325952