39170

Appears in sequences

• Numbers n such that 6*10^n + 4*R_n + 3 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=21A103036
• Number of 0..n arrays of length 3 with 0 never adjacent to n.at n=32A212836
• Number of Proth primes < 10^n.at n=11A239234
• Number of subsets of {1..n} of which every subset has a different sum.at n=28A325864
• Expansion of 1/(g * (2-g)), where g = 1+x*g^3 is the g.f. of A001764.at n=8A391208