20102

Appears in sequences

• Primes in ternary.at n=39A001363
• Numbers whose square is a palindrome.at n=27A002778
• [ (3rd elementary symmetric function of 3,4,...,n+4)/(3+4+...+n+4) ].at n=22A024191
• Numbers k such that k^2 is a palindrome with an odd number of digits.at n=26A028816
• Base-10 palindromes that start with 2.at n=23A043037
• In the list of divisors of n (in base 3), each digit 0-2 appears equally often.at n=7A045811
• Composite palindromes whose sum of prime factors is prime (counted with multiplicity).at n=43A046365
• Palindromes whose square is a palindrome; also palindromes whose sum of squares of digits is less than 10.at n=21A057135
• Numbers k such that k^2 contains only digits {0,4,9}, not ending with zero.at n=8A058443
• Palindromes such that the least common multiple of any pair of successive terms is a palindrome.at n=42A082616
• Terms of A083393 such that the sum of the factorials of the digits is prime.at n=11A083394
• Largest n-digit palindrome with a digit sum of n.at n=4A083441
• Palindromes in A085936.at n=11A085937
• Palindromic numbers with property that sum of digits is prime and number of prime digits is prime.at n=26A093807
• Numbers n such that 5*10^n + 8*R_n - 1 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=8A103023
• The n-th row of the following array contains all palindromes, with at most n digits, with digit sum n. Sequence contains the array by rows.at n=16A109858
• Palindromic primes in base 3 (written in base 3).at n=4A117698
• Palindromic primes in base 5 (written in base 5).at n=11A117700
• Palindromes in base 3 (written in base 3).at n=27A118594
• Palindromes m such that reverse of m^2 is also a square.at n=23A128921