138623

Appears in sequences

• Number of polyhexes with n cells that tile the plane by 180-degree rotation (Conway criterion).at n=12A075211
• Odd composite numbers k all of whose divisors larger than 1 are not binary palindromes (A006995) such that the divisors of the binary reversal of k (A030101) are the binary reversals of the divisors of k.at n=24A331664