20839

Appears in sequences

• Number of partitions of n into a prime number of parts.at n=43A038499
• Number of nonempty subsets of {1,2,...,n} in which exactly 2/3 of the elements are <= sqrt(n).at n=44A048095
• Structured pentagonal icositetrahedral numbers (vertex structure 10).at n=12A100168
• Number of parts in all partitions of n in which no part occurs more than 3 times.at n=31A117148
• Total number of palindromic primes in base 9 with n digits.at n=10A117788
• Lengths of bit runs in A123504.at n=46A123505
• Number of simple labeled graphs of order n that have 3k connected components for some k.at n=7A249672
• Relative of Hofstadter Q-sequence: a(n) = max(0, n+20830) for n <= 0; a(n) = a(n-a(n-1)) + a(n-a(n-2)) + a(n-a(n-3)) for n > 0.at n=11A283887
• Relative of Hofstadter Q-sequence: a(n) = max(0, n+20830) for n <= 0; a(n) = a(n-a(n-1)) + a(n-a(n-2)) + a(n-a(n-3)) for n > 0.at n=29A283887