22352

Appears in sequences

• Hexagonal pyramidal numbers, or greengrocer's numbers.at n=32A002412
• Even hexagonal pyramidal numbers.at n=15A015226
• Denominators of continued fraction convergents to sqrt(379).at n=8A041719
• Number of series-parallel networks with n unlabeled edges, multiple edges not allowed.at n=14A058387
• 47-gonal numbers.at n=31A095311
• Numbers k such that 10^k + 13 is prime.at n=18A095688
• Structured hexagonal anti-prism numbers.at n=21A100183
• a(n) = 4*a(n-1) - 4*a(n-2) + 2*a(n-4), with a(0)=a(1)=a(2)=0, and a(3)=1.at n=13A135248
• Array read by rows: T(n,k) is the number of directed multigraphs with loops with n arcs, k vertices, and no vertex of degree 0.at n=47A136564
• Numbers n with property that n^2 is a sum of some 70 successive primes.at n=30A166256
• Numbers k such that (2^k - k - 1)*2^k + 1 is prime.at n=21A201362
• a(n) = -(8*a(n-4)*a(n-1)+57*a(n-3)*a(n-2))/a(n-5) with initial values 1, 0, -1, 1, 8, 57, -455.at n=7A241594
• a(n) = floor(log_10(1/error(n))), where error(n) is the error in the n-th iteration of the Salamin-Brent algorithm for computing Pi.at n=13A276778
• Total area of all rectangles of size p X q such that p + q = n^2 and p <= q.at n=7A303120
• Number of partitions of n into 6 or more distinct parts.at n=49A347573
• a(n) = prime(n)^2 + prime(n+1).at n=34A352851
• Generalized Somos-5 sequence a(n) = (a(n-1)*a(n-4) + a(n-2)*a(n-3))/a(n-5) = -a(-n), a(1) = 1, a(2) = -1, a(3) = a(4) = 1, a(5) = -7.at n=12A360381