120395

Appears in sequences

• Numbers k such that the concatenation of k with k+5 gives a square.at n=7A115428
• Numbers k such that k concatenated with k-4 gives the product of two numbers which differ by 6.at n=5A116131
• Numbers k such that 3*R_(k+2) + 4*10^k is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=19A257025