23779

Appears in sequences

• Numbers that are the sum of 9 positive 9th powers.at n=18A003398
• Multiply by 1, add 1, multiply by 2, add 2, etc., start with 2.at n=14A019465
• a(n)=Sum{T(n,j): j=1,2,...,n}, array T given by A048201.at n=31A048209
• Numbers k such that the largest prime factor of k is equal to the sum of primes dividing k+1 (with repetition).at n=23A071861
• Antidiagonal sums in A101321.at n=27A101338
• Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n and having height of the first peak equal to k (1 <= k <= n).at n=48A128744
• E.g.f. satisfies: A(x) = exp( sinh(x*A(x)) ).at n=6A162650
• a(n) = (-1)^n*n*(n+1)*(2*n-5)/6.at n=41A167386
• The odd composites c such that c=q*g*j*y/2 and q+g=j*y where q,g,j,y are distinct primes.at n=36A167629
• Number of ordered triples (w,x,y) with all terms in {1,...,n} and 2w^3>x^3+y^3.at n=37A211811
• Number of (w,x,y) with all terms in {0,...,n} and |w-x|+|x-y|+|y-w| != w+x+y.at n=28A213485
• Numbers of the form 3^j + 8^k, for j and k >= 0.at n=49A226821
• Composite squarefree numbers k such that the arithmetic mean of the distinct prime factors of k is a prime p, and p divides k.at n=35A229094
• Products of three distinct primes that form an arithmetic progression.at n=23A262723
• The sum of the semiperimeters of the bargraphs of area n (n>=1).at n=11A273348
• Numbers x that are equal to lpf(x)*gpf(x)*(lpf(x)+gpf(x))/2, where lpf(x) < gpf(x) are the least and the greatest prime factors of x: A020639 and A006530.at n=26A307108
• Numbers x that are equal to lpf(x)*gpf(x)*(lpf(x)+gpf(x))/2, where lpf(x) and gpf(x) are the least and the greatest prime factors of x: A020639 and A006530.at n=35A307117