18348

Appears in sequences

• Numbers k such that (5*3^k - 7)/2 is prime.at n=19A059622
• Fifth column (m=4) of triangle A060098.at n=12A060100
• Fifth column (m=4) of triangle A060102.at n=6A060104
• a(n) is the number of different degrees in the sequence of the degrees of the irreducible representations of the symmetric group S_n, i.e., count each degree only once.at n=40A060437
• Diagonal sums of A107111, viewed as a number triangle.at n=13A107113
• Triangle read by rows: T(n,k) is the number of ternary words of length n on {0,1,2} having sum of the lengths of the drops equal to k (n>=0, k>=0). The drops of a ternary word on {0,1,2} are the subwords 10,20 and 21, their lengths being the differences 1, 2 and 1, respectively.at n=54A120907
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 411", based on the 5-celled von Neumann neighborhood.at n=15A281896
• E.g.f.: exp(x/(1 - x)) / (1 + x).at n=7A331725
• Sum of the areas of all r X s rectangles such that r + s = 2n, with r, s composite.at n=34A334229
• Irregular table read by rows: T(n,k) is the number of k-gons, k>=2, among all distinct circles that can be constructed from a 2 x n square grid of points using only a compass.at n=58A359862
• Numbers k such that k^7*2^k + 1 is a prime.at n=17A367560
• Number of distinct sums i^3 + j^3 + k^3 + l^3 for 1<=i<=j<=k<=l<=n.at n=26A374714
• Number of integer partitions of n whose maximal anti-runs do not all have different maxima.at n=37A375401