90155

Appears in sequences

• Least m such that sqrt(m) has a period 2n continued fraction expansion whose palindrome part concatenates to a palindromic prime.at n=15A072135
• Numbers k such that 3*R_(k+2) - 10^k is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=23A256375
• Numbers equal to the determinant of a circulant matrix based on the base-9 digits of n.at n=19A303369