20450

Appears in sequences

• Numbers that are the sum of 3 nonzero 6th powers.at n=28A003359
• Quadrinomial coefficients: C(2+n,n) + C(3+n,n) + C(4+n,n).at n=23A005718
• Numbers k such that k^2 and k^3 have the same set of digits.at n=26A029797
• Ruth-Aaron numbers (2): sum of prime divisors of n = sum of prime divisors of n+1 (both taken with multiplicity).at n=26A039752
• Numbers n such that n | 5^n + 4^n + 3^n.at n=27A057236
• Numbers k such that sopfr(k) = sopf(k+1), where sopf(k) = A008472(k) and sopfr(k) = A001414(k).at n=17A064675
• a(n) = 3^n + 4^n + 5^n.at n=6A074547
• Numbers of the form (square + 1) that are not squarefree.at n=16A124809
• G.f. is the polynomial (Product_{k=1..25} (1 - x^(3*k)))/(1-x)^25.at n=4A162702
• Sum of distinct nonzero sixth powers.at n=27A194769
• Number of 4-tuples (w,x,y,z) with all terms in {1,...,n} and w*x>2*y*z.at n=16A211797
• Numbers which are the sums of consecutive sixth powers.at n=13A217846
• Number of unbalanced partitions of n: the largest part is not equal to the number of parts.at n=36A236634
• Numbers k such that (73*10^k + 143)/9 is prime.at n=24A272193
• a(n) = (conjectured) smallest positive integer k which is neither of the form p + n^x nor of the form p - n^x with x >= 0 and p prime, where gcd(k, n) = 1 and gcd(k^2-1, n-1) = 1.at n=19A283619
• Numbers of the form m^2 + 1 that can be expressed in more than one way as j^2 + k^2 with j > k > 1.at n=26A299708
• Number of n element multisets of the 10th roots of unity with zero sum.at n=41A321416
• a(n) = Sum_{d|n} (n-d)^n.at n=5A367493
• Number of maximal irredundant sets in the n-double cone graph.at n=12A392237