18858

Appears in sequences

• Multiplicity of highest weight (or singular) vectors associated with character chi_4 of Monster module.at n=51A034392
• Numbers k such that binomial(4k, k) - 1 is prime.at n=17A125240
• Numbers k such that 5^k mod k = 5^k mod k^2.at n=32A125775
• Numbers k such that k^2 divides 5^k-1.at n=26A127105
• Numbers k such that k * Fibonacci(k) + 1 is prime.at n=40A134313
• Numbers n = concat(a,b) such that phi(n) = phi(a) * phi(b), where phi = A000010.at n=30A147619
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 197", based on the 5-celled von Neumann neighborhood.at n=30A270718
• a(n) = PrimePi(A246033(n)) (where PrimePi = A000720).at n=43A290652
• a(n) = 36*n^2 - 8*n - 2 (n >=1).at n=22A304834
• Sum of the second largest parts of the partitions of n into 9 parts.at n=38A326472
• Inverse Euler transform of odd primes.at n=24A352609
• Product_{n>=1} (1 + x^n)^a(n) = 1 + Sum_{n>=1} prime(n+1) * x^n.at n=24A353160
• Table read by antidiagonals: Place k points in general position on each side of a regular n-gon and join every pair of the n*(k+1) boundary points by a chord; T(n,k) (n >= 3, k >= 0) gives number of vertices in the resulting planar graph.at n=32A367183
• Largest m such that any two consecutive digits of the base-n expansion of m^2 differ by 1 after arranging the digits in decreasing order.at n=7A370371
• Expansion of 1 / ((1-x)^2 - x^6)^2.at n=18A392554