18615

Appears in sequences

• One eighty-fourth the area of primitive Pythagorean triangles with (increasing) square hypotenuses (precisely those of A008846).at n=7A072289
• Expansion of f(-q)^10*Q(q) in powers of q.at n=4A122269
• 3 times 13-gonal (or tridecagonal) numbers: a(n) = 3*n*(11*n - 9)/2.at n=34A153875
• a(n) = n*(14*n + 13) + 3.at n=36A195029
• Composite squarefree numbers n such that p(i)-9 divides n+9, where p(i) are the prime factors of n.at n=42A225709
• Zeroless numbers n whose digit product squared is equal to the digit product of n^2.at n=17A256115
• Odd numbers n such that q(n)^2 = q(n^2) != 0, where q(n) is the digit product on base 10.at n=9A278316
• Expansion of 1/(1 - x/(1 - x^4/(1 - x^10/(1 - x^20/(1 - x^35/(1 - ... - x^(k*(k+1)*(k+2)/6)/(1 - ...))))))), a continued fraction.at n=33A295072
• Number of 5-element subsets of [n] whose sum is a triangular number.at n=28A320851