26220

Appears in sequences

• Star of David matchstick numbers: a(n) = 6*n*(3*n+1).at n=38A045946
• Partial sums of second pentagonal numbers with even index (A049453).at n=23A051895
• Least area of primitive Pythagorean triangle whose legs differ by A058529(n).at n=22A094143
• Phi(A033631(n)) {phi is the Euler totient function A000010}.at n=15A115620
• Triangle T(n, k) = T(n-1, k) + T(n-1, k-1) + (j+4)*prime(j)*T(n-2, k-1) with j=5, read by rows.at n=12A153650
• Numbers n such that 36n+11, 36(n+1)+11, 36(n+2)+11 and 36(n+3)+11 are prime.at n=26A255608
• Length of period of Narayana sequence A000930 modulo n-th prime.at n=49A271901
• Least integer k such that the area of the triangle (prime(n), k, k+1) is an integer.at n=48A286328
• Total volume of the family of rectangular prisms with dimensions p, q, and |q - p| where p divides q, n = p + q and p < q.at n=39A303479
• Indices of records of A232928.at n=10A329953
• a(n) = [2^n csc(1/n)] - [2^n cot(1/n)], where [ ] = floor.at n=19A333188
• The sixth term of the greedy B_n set of natural numbers.at n=15A369818