121242121
domain: N
Appears in sequences
- Palindromic squares.at n=23A002779
- Palindromic squares with an odd number of digits.at n=21A028817
- Palindromes whose sum of divisors is odd.at n=30A028984
- Squares composed of digits {1,2,4}.at n=9A053881
- Palindromes whose square root is a palindrome.at n=17A057136
- Palindromic perfect powers.at n=27A075786
- Squares of the form u'v'w, where in decimal representation u=n^2, v=2*n^2 and w=n^2 possibly with a leading zero.at n=10A077432
- Largest square which is a concatenation of partitions of n; or 0 if no such number exists.at n=15A079842
- Squares of A057148 taken as decimal numbers.at n=9A176923
- Number of 5Xn 0..1 arrays avoiding 0 0 1 and 0 1 1 horizontally and 0 0 1 and 1 0 1 vertically.at n=19A208144
- Palindromes in base 5 which are also squares.at n=11A263612
- Squares whose digits are powers of 2.at n=35A272884
- a(n) = A128921(n)^2.at n=19A319483
- Perfect powers m^k, m >= 1, k >= 2 such that m and m^k both are palindromes.at n=21A348429
- Largest palindromic square which is a concatenation of partitions of n; or 0 if no such number exists.at n=15A370512