20711

Appears in sequences

• a(n) = a(n-2) + a(n-3) + a(n-4), with initial values a(0) = 0, a(1) = 2, a(2) = 3, a(3) = 6.at n=25A001634
• Numbers that are the sum of 11 positive 8th powers.at n=37A003389
• Numbers that are the sum of 7 positive 9th powers.at n=10A003396
• Products of 2 successive primes.at n=33A006094
• Coordination sequence for MgZn2, Mg position.at n=36A009939
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 23 ones.at n=14A031791
• Denominators of continued fraction convergents to sqrt(893).at n=11A042727
• a(1) = 1, a(2n) = smallest prime > (2n-1)-th partial sum of the sequence itself and a(2n+1) = smallest composite number > 2n-th partial sum of the sequence.at n=14A076636
• Least odd number k such that x' = k has n solutions, where x' is the arithmetic derivative (A003415) of x.at n=29A189560
• a(n) = A050376(n)*A050376(n+1) where A050376(n) is the n-th number of the form p^(2^k) with p is prime and k >= 0.at n=40A240521
• Numbers that are both a sum and a product of two or more consecutive primes.at n=16A254859
• Sequence of pairwise relatively prime numbers of class P_3 (see comment).at n=17A275246
• Trajectory of n under the Reverse and Add! operation carried out in base 8 (presumably) does not reach a palindrome and (presumably) does not join the trajectory of any term m < n.at n=29A306596
• Number of multisets of nonempty sets of nonempty multisets of positive integers with total sum n.at n=12A330458
• Number of compositions of n whose run-lengths are weakly increasing.at n=18A332836
• a(n) is the number of reducible monic cubic polynomials x^3 + r*x^2 + s*x + t with integer coefficients bounded by naïve height n (abs(r), abs(s), abs(t) <= n).at n=37A358398
• Composite terms in A376471.at n=40A376472