31613

Appears in sequences

• Base-10 palindromes that starts with 3.at n=38A043038
• Composite palindromes with only palindromic prime factors whose sum is palindromic (counted with multiplicity).at n=13A046357
• Palindromes with exactly 2 palindromic prime factors (counted with multiplicity), and no other prime factors.at n=35A046376
• Palindromes with exactly 2 distinct palindromic prime factors.at n=31A046408
• Palindromic brilliant numbers.at n=17A084350
• Palindromic hypotenuses in primitive Pythagorean triples.at n=35A087456
• Brilliant numbers (A078972) whose digit reversal is the product of 2 palindromes greater than 1.at n=33A115681
• Palindromic composite numbers starting with a digit 3.at n=26A222726
• Irregular array read by rows. a(n) is the largest element in the primitive Collatz-like 3x-k cycle associated with A226623(n).at n=10A226624
• Conjectured record-breaking values, for ascending positive integers k, of the maximal element of the primitive cycles of positive integers under iteration by the 3x-k function.at n=3A226683
• Palindromes in base 10 >= 256 that remain palindromes when the digits are reversed in base 256.at n=1A253147
• Composite palindromes whose divisors > 1 are all nontrivial palindromes (i.e., palindromes with at least two digits).at n=17A329100
• Nonprime base-10 palindromes whose arithmetic derivative is a base-10 palindrome.at n=19A363248
• Palindromic squarefree semiprimes such that the sum of the two prime factors is also a palindrome.at n=8A374331