18236

Appears in sequences

• Number of labeled T_0-hypergraphs with n distinct hyperedges (empty hyperedge included).at n=3A059086
• Second partial sums of fifth powers (A000584).at n=5A101092
• Least common multiple of prime(n)-3 and prime(n)+3.at n=42A166011
• Indices of primes that are the sum of two Fibonacci numbers.at n=37A178971
• Irregular triangle read by rows: row n lists the rank sizes of the "electrical" poset EP_n of circular planar graphs with n boundary vertices.at n=81A232967
• Number of (n+1)X(5+1) 0..1 arrays with every 2X2 subblock ne-sw antidiagonal difference unequal to its neighbors horizontally and nw+se diagonal sum unequal to its neighbors vertically.at n=9A253695
• a(n) = 1*6^n + 2*5^n + 3*4^n + 4*3^n + 5*2^n + 6*1^n.at n=5A254144
• Numbers k such that R_k + 20 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=19A256722
• Number of even-length columns in all bargraphs having semiperimeter n (n>=2).at n=9A273904
• Expansion of e.g.f. 1/(1 - Sum_{k>=1} d(k) * x^k / k), where d(n) = number of divisors of n (A000005).at n=6A353186
• Expansion of e.g.f. exp(x - 5*x^2/2).at n=8A362279