18120

Appears in sequences

• a(n) = [ a(n-1)/a(1) + a(n-2)/a(2) + ... + a(1)/a(n-1) ], for n >= 3.at n=18A022857
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 19 ones.at n=12A031787
• Multiplicity of highest weight (or singular) vectors associated with character chi_5 of Monster module.at n=49A034393
• Number of partitions in parts not of the form 25k, 25k+3 or 25k-3. Also number of partitions with at most 2 parts of size 1 and differences between parts at distance 11 are greater than 1.at n=40A036002
• Numbers k such that 285*2^k-1 is prime.at n=45A050901
• Numbers k such that k-1, k+1 and k^2+1 are prime numbers.at n=34A070155
• Number of n-digit base-11 deletable primes.at n=6A096244
• Determinants of 4 X 4 matrices of 16 consecutive primes.at n=29A118799
• Numbers m such that m^4-1 has no divisors d with 1 < d < m-1.at n=35A129293
• Number of embedded coalitions in an n-person game where the position of the individual player is important.at n=4A138379
• The number of unigraphical partitions of 2m; that is, the number of partitions of 2m which are realizable as the degree sequence of one and only one graph (where loops are not allowed but multiple edges are allowed).at n=35A143981
• Averages of twin prime pairs that are sums of 5 consecutive averages of twin prime pairs.at n=13A160919
• Number of nX5 1..4 arrays with all 1s connected, all 2s connected, all 3s connected, all 4s connected, 1 in the upper left corner, 2 in the upper right corner, 3 in the lower left corner, 4 in the lower right corner, and with no element having more than 2 neighbors with the same value.at n=7A164757
• Triangle T(n,m)= A141686(n,m)*(m-1)! read by rows, n>=1, 1<=m<=n.at n=18A177428
• Number of (w,x,y,z) with all terms in {1,...,n} and w+x>=2y+2z.at n=19A212565
• Numbers k such that k+1, 2k+1, 3k+1, 4k+1 are all prime.at n=8A237189
• Rounded down ratio of a minimum intersection area with a unit circle area in n-symmetrical unit circles intersect in a single point.at n=28A243933
• Numbers n such that sigma(n+sigma(n)) = 4*sigma(n).at n=38A246911
• The growth series for the affine Weyl group F_4.at n=33A266784
• p-INVERT of the positive Fibonacci numbers (A000045), where p(S) = 1 - S - S^2.at n=9A289781