19291

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 63 ones.at n=0A031831
• Numbers k such that (k*(k+1)*(k+2)) / (k+(k+1)+(k+2)) is a palindrome.at n=14A032789
• Composite palindromes whose sum of prime factors is palindromic (counted with multiplicity).at n=29A046354
• Composite palindromes with only palindromic prime factors whose sum is palindromic (counted with multiplicity).at n=12A046357
• Palindromes with exactly 2 palindromic prime factors (counted with multiplicity), and no other prime factors.at n=27A046376
• Palindromes with exactly 2 distinct palindromic prime factors.at n=23A046408
• Composite numbers which in base 6 contain their largest proper factor as a substring.at n=8A063156
• Duplicate of A063156.at n=8A063876
• Numbers n for which there are exactly ten k such that n = k + reverse(k).at n=13A072434
• Numbers k such that the digits of k^2 are exactly the same (albeit in different order) as the digits of (k+1)^2.at n=6A072841
• Expansion of (1-x)^(-1)/(1-x-2*x^2-2*x^3).at n=12A077863
• a(n) = concatenate(n, A010888(2*n), reverse(n)), where A010888 = digital root.at n=18A082944
• Smallest nontrivial palindromic multiple of the n-th palindrome (a(n) is not equal to the n-th palindrome).at n=27A083145
• Smallest palindromic multiple of n-th palindrome which is not a concatenation of copies of that palindrome.at n=27A083146
• Palindromic brilliant numbers.at n=15A084350
• Smallest palindromic multiple (not equal to the number itself) of the palindromes not included earlier.at n=27A085920
• Numbers k such that 6*k+5, 6*k+11, 6*k+17, 6*k+23 are consecutive primes.at n=20A090836
• Brilliant numbers (A078972) whose digit reversal is the product of 2 palindromes greater than 1.at n=24A115681
• Palindromes for which the multiplicative digital root is a prime.at n=26A117059
• Start with 1 and repeatedly reverse the digits and add 38 to get the next term.at n=24A118634