20787

Appears in sequences

• a(n) = dot_product(1,2,...,n)*(5,6,...,n,1,2,3,4).at n=36A026043
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 25 ones.at n=12A031793
• Number of partitions of n into parts not of the form 13k, 13k+6 or 13k-6. Also number of partitions with at most 5 parts of size 1 and differences between parts at distance 5 are greater than 1.at n=42A035954
• Surround numbers of an n X 2 rectangle when n is odd.at n=8A061525
• Number of binary strings of length n with equal numbers of 00000 and 00010 substrings.at n=15A164179
• Number of Carlitz compositions of n with exactly one descent.at n=29A241691
• 30-gonal numbers: a(n) = n*(14*n-13).at n=39A254474
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 721", based on the 5-celled von Neumann neighborhood.at n=24A273447
• Numbers that are the sum of eight fourth powers in nine or more ways.at n=16A345584
• Numbers that are the sum of eight fourth powers in ten or more ways.at n=6A345585
• Number of partitions of n that contain more prime parts than nonprime parts.at n=43A355225
• a(n) = (1/2) * Sum_{d|n} (2*d)^(n/d).at n=14A359733