22682

Appears in sequences

• Numbers k such that sigma(k) = phi(k+1) + phi(k-1).at n=6A068401
• a(n) = 4 + 8*n + 10*n^2 + 4*n^3.at n=17A100207
• Numbers n such that 6*10^n + 8*R_n - 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=13A103045
• Numbers k such that (2^k + k + 1)*2^k + 1 is prime.at n=18A201356
• Sphenic numbers k = p*q*r such that reversal(k) is also a sphenic number and reversal(k) = reversal(p)*reversal(q)*reversal(r).at n=19A242726
• Numbers k at which point A336459(k) appears multiplicative, but A051027(k) does not.at n=42A336561