18522

Appears in sequences

• G.f.: 2*(1-x^3)/((1-x)^5*(1+x)^2).at n=40A005996
• a(n) = d(n)/2, where d = A026040.at n=45A026041
• a(n) = 49*(n-1)*(n-2)/2.at n=26A027469
• a(n) = 2*n^3.at n=21A033431
• Numbers whose base-7 representation contains exactly four 0's.at n=28A043396
• Triangle of numbers related to A000330 (sum of squares) and A000364 (Euler numbers).at n=38A060058
• Third column of triangle A060058.at n=6A060060
• Numbers k such that sopf(k) = d(k) where d(k) = A001223(k) and sopf(k) = A008472(k).at n=32A064010
• Triangle formed by multiplying Stirling numbers of 2nd kind S2(n,m) (A008277) by m+1.at n=41A069138
• Trisection of A007294.at n=38A073472
• Numbers k such that sopfr(k)=tau(k).at n=33A078511
• Numbers k such that 5*R_k + 2 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=13A099417
• Number of partitions of n in which the number of parts is relatively prime to n.at n=38A102628
• Numbers with at least two 3s in their prime signature.at n=45A109399
• Cubic polynomial coefficients such that an elliptical term is zero.at n=41A114798
• a(n) = n*floor(n/2)^2.at n=42A122656
• Averages of twin prime pairs which are a sum of averages of two consecutive twin prime pairs.at n=32A160916
• a(n) = binomial(n+1,2)*7^2.at n=27A162942
• Totally multiplicative sequence with a(p) = 7*(p+1) for prime p.at n=19A166647
• Numbers of the form p^3*q^3*r where p, q, and r are prime.at n=29A179688