20700

Appears in sequences

• Number of degree-n permutations of order dividing 30.at n=8A053505
• Number of step cyclic shifted sequences using exactly four different symbols.at n=9A056417
• Structured meta-prism numbers, the n-th number from a structured n-gonal prism number sequence.at n=14A100177
• Exponential aspiring numbers.at n=36A127658
• Exponential abundant numbers: integers k for which A126164(k) > k, or equivalently for which A051377(k) > 2k.at n=21A129575
• a(n) = A000203(n) * A024916(n).at n=28A143238
• a(n) = 16*n^2 - n.at n=35A157446
• a(n) = 64*n^2 - 2*n.at n=17A158067
• a(n) = 1296*n^2 - 36.at n=3A158737
• Number of paths from (0,0) to (n,n) avoiding 3 or more consecutive east steps and 3 or more consecutive north steps.at n=11A177790
• Numbers with prime factorization pq^2r^2s^2.at n=8A189344
• a(n) = 23*n^2.at n=30A244632
• The area of a primitive Heronian triangle K, such that K = k^2*n for the least k, where n is the sequence index.at n=22A247381
• Numbers of the form Bell(i)*Bell(j).at n=26A276281
• a(n) = Product_{d|n, d<n} prime(A286622(d)-1).at n=53A305792
• Number T(n,k) of permutations of [n] with exactly k distinct lengths of increasing runs; triangle T(n,k), n>=0, 0<=k<=A003056(n), read by rows.at n=25A317327
• Numbers that are not Keith numbers in any base.at n=27A320122
• Exponential pseudoperfect numbers (A318100) that are not e-perfect (A054979).at n=19A321206
• Exponential admirable numbers: numbers k such that there is a proper exponential divisor d of k such that esigma(k) - 2*d = 2*k, where esigma is the sum of exponential divisors function (A051377).at n=19A336680
• Numbers with exactly 9 semiprime divisors.at n=12A350416