21824

Appears in sequences

• a(n) = floor(n*phi^15), where phi is the golden ratio, A001622.at n=16A004930
• a(n) = round(n*phi^15), where phi is the golden ratio, A001622.at n=16A004950
• Let sigma_m (n) be result of applying sum-of-divisors function m times to n; call n (m,k)-perfect if sigma_m (n) = k*n; sequence gives the (4,k)-perfect numbers.at n=47A019293
• Number of 2n-bead balanced binary strings, rotationally equivalent to reversed complement, inequivalent to reverse and complement.at n=11A045660
• Number of 2n-bead balanced binary strings of fundamental period 2n, rotationally equivalent to reversed complement, inequivalent to reverse and complement.at n=11A045669
• Numbers with exactly 2 odd integers in their Collatz (or 3x+1) trajectory.at n=45A062052
• XOR BINOMIAL transform of the powers of 3.at n=9A099888
• Numbers which are the sum of two positive cubes and divisible by 11.at n=29A101852
• Numbers which are the sum of two positive cubes and divisible by 31.at n=33A102658
• Let b(n) = A112455(n). Then b(n)/n is an integer iff n is prime (at least for the first few values, as for the Perrin sequence). This sequence is the values of b(p)/p, where p is the n th prime.at n=19A112458
• Floor(Fibonacci(2n+1)/9).at n=13A156561
• G.f.: (1+3*x+12*x^2+48*x^3)/(1-x-256*x^4).at n=7A158778
• Row sums of A163357 and A163359.at n=31A163365
• Antidiagonal sums of A147995 and A163545.at n=31A163484
• Number of partitions into a triangular number of parts.at n=46A178927
• Greatest k such that floor(k/r^n)=n, where r = golden mean = (1+sqrt(5))/2.at n=14A182615
• Number of 7-step S, NW and NE-moving king's tours on an n X n board summed over all starting positions.at n=9A187381
• a(n) = 4*a(n-1) - 10*a(n-2), with a(0)=0, a(1)=1.at n=10A190968
• Molecular topological index of the Andrásfai graphs.at n=10A192790
• Triangle T(n,k), n>=0, 0<=k<=C(n,2), read by rows: T(n,k) = number of k-length chains in the poset of Dyck paths of semilength n ordered by inclusion.at n=23A193629