19746

Appears in sequences

• Numbers k such that 5*10^k + 4*R_k - 3 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=17A103013
• Partial sums of A255745.at n=22A255766
• Growth series for affine Coxeter group (or affine Weyl group) D_8.at n=9A266763
• Number of integers in n-th generation of tree T(3^(-1/2)) defined in Comments.at n=48A274157
• Sum of number of divisors of x^y for each x >= 1, y >= 0, x + y = n.at n=44A343657
• Viggo Brun's ternary continued fraction algorithm applied to { log 2, log 3/2, log 5/4 } produces a list of triples (p,q,r); sequence gives q values.at n=27A359743
• Total number of parts coprime to n in the partitions of n into 9 parts.at n=36A363327