43362

Appears in sequences

• Numbers n such that 4*10^n + 3*R_n + 6 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=19A102990
• Heptagonal numbers for which the sum of the digits is also a heptagonal number.at n=33A117650
• Number of pairs (x, y) with 0 <= x, y <= n such that the distance between two points is a positive integer.at n=29A228108
• Numbers k that divide the k-th companion Pell number.at n=42A372899
• G.f. A(x) satisfies A(x) = ( (1 + x*A(x)^3)/(1 - x*A(x)) )^3.at n=4A379246