24853

Appears in sequences

• High temperature series for spin-1/2 Ising free energy on 3-dimensional simple cubic lattice.at n=6A001393
• Fibonacci sequence beginning 1, 9.at n=18A022099
• Number of simple unlabeled n-node graphs with 4 center nodes.at n=8A052440
• a(n) = 3*a(n-1) - a(n-2) with a(0)=1, a(1)=10.at n=9A055850
• Numbers k such that 5*10^k + 9 is prime.at n=13A103004
• Numerator of Bernoulli(n, -4/9).at n=4A158959
• Positive numbers y such that y^2 is of the form x^2+(x+857)^2 with integer x.at n=7A160206
• Triangle read by rows: row n contains sequence S_n = [s(1), ..., s(n)] where s(1) is the least semiprime pq such that the recurrence s(i+1) = sum of two prime factors of s(i) generates a chain of exactly n semiprimes.at n=58A171095
• a(n) = pi(phi(p(P(n)))) = A000720(A000010(A000041(A000040(n)))).at n=16A247087
• Triangle read by rows: T(n,k) is the number of simple connected graphs on n nodes with k center nodes.at n=39A294525
• T(n,k) is the number of non-equivalent distinguishing partitions of the cycle on n vertices with exactly k parts. Regular triangle read by rows, n >= 1, 1 <= k <= n.at n=69A324802
• Numbers k such that the digit sum of 5^k is a power of 5.at n=9A359281