21560

Appears in sequences

• Positive numbers k such that k and 3*k are anagrams in base 8 (written in base 8).at n=11A023074
• Convolution of odd numbers and A000201.at n=33A023658
• Maximization of sums of cubes of integer differences (b_[ i ]-i)^3 over permutations {b_[ i ], for i-1,2,...,n} on first n integers.at n=27A049031
• Number of hexagonal regions in regular n-gon with all diagonals drawn.at n=49A067153
• Sum of first n 8-almost primes.at n=16A086061
• Number of partitions of n in which no parts are multiples of 25.at n=37A092885
• Triangle T(n,k) read by rows: (1/n) * C(2n+k,k-1) * C(n,k); n, k >= 1.at n=39A102537
• a(n) = n*(n+13)*(n+14)/6.at n=42A111144
• a(n) = (1/6)*(n^6+3*n^4+12*n^3+8*n^2).at n=7A115286
• a(n) = 22 + floor( Sum_{j=1..n-1} a(j)/2 ).at n=17A120146
• Number of zeros in n-th even perfect number written in base 16.at n=27A161496
• Integer averages of halves of first cubes of natural numbers (n^3)/2 for some n.at n=19A164579
• Numbers such that each digit from 0 to 9 appears at least 7 times in the digits of their divisors.at n=31A175507
• Molecular topological indices of the cycle graphs.at n=34A192797
• a(n) is the optimal wire-length for an n X n grid.at n=28A195647
• Number of (n+1) X (n+1) -3..3 symmetric matrices with every 2 X 2 subblock having sum zero and two or three distinct values.at n=9A211325
• Number of partitions p of n such that max(p) - (number of parts of p) is not a part of p.at n=37A238545
• Triangle read by rows: the reversed x = 1+q Narayana triangle at m=2.at n=41A243662
• Numbers n such that A003146(n) = floor(alpha^3*n)+1, where alpha = 1.839... is the positive real zero of x^3-x^2-x-1.at n=23A278353
• Number of permutations of {1..n} whose differences of all degrees are nonzero.at n=8A325850