187891

Appears in sequences

• Sum of the heights of the base pyramids in all dispersed Dyck paths of length n (i.e., in all Motzkin paths of length n with no (1,0)-steps at positive heights). A base pyramid is a factor of the form U^j D^j (j>0), starting at the horizontal axis. Here U=(1,1) and D=(1,-1).at n=18A191396
• a(n) = smallest k having at least four prime divisors d such that (d + n) | (k + n).at n=28A202159
• Squarefree terms of A129802 whose prime factors are neither elite (A102742) nor anti-elite (A128852), where A129802 is the possible bases for Pepin's primality test for Fermat numbers.at n=23A372895
• a(n) is the smallest nonnegative integer k where exactly n solutions to x^2 + 3*x*y + y^2 = k with 0 < x < y.at n=8A374095
• Smallest k such that k can be written in exactly n ways as x^2 + 3*x*y + y^2 with 0 <= x <= y.at n=8A374275