1226221

Appears in sequences

• Concatenation of prime factors of palindromic composite is a palindrome.at n=12A046450
• Semiprimes whose prime factors are distinct and the reversal of one factor is equal to the other.at n=18A083815
• Palindromes whose squares belong to A066531.at n=14A117281
• Terms in A144719 that are themselves decimal palindromes.at n=4A144766
• Palindromic numbers which are the product of a number k and its reversal (k written backwards).at n=17A158642
• Palindromic numbers that are fixed points of the TITO operation (see A161594) and are not products of palindromic primes.at n=4A161730
• Numbers m such that set of divisors of m is equal to set of reversals of divisors of m but all divisors of m are not palindromic.at n=0A192219
• Numbers k with at least one nonpalindromic divisor such that the sum of phi(d) = the sum of phi(reverse(d)), where d runs over the divisors of k and phi is the Euler totient function.at n=12A246545
• Numbers k with at least one nonpalindromic divisor such that the sum of sigma(d) = the sum of sigma(reverse(d)), where d runs over the divisors of k.at n=6A247826
• Nonprime base-10 palindromes whose arithmetic derivative is a base-10 palindrome.at n=38A363248
• Palindromes that have at least two distinct prime factors and whose prime factors, listed (with multiplicity) in descending order and concatenated, form a palindrome in base 10.at n=4A364023
• Palindromes that have at least two distinct prime factors and whose prime factors, listed (with multiplicity) in ascending order and concatenated, form a palindrome in base 10.at n=3A364050
• Palindromic squarefree semiprimes such that the sum of the two prime factors is also a palindrome.at n=19A374331