1234321
domain: N
Appears in sequences
- Wonderful Demlo numbers: a(n) = ((10^n - 1)/9)^2.at n=3A002477
- Palindromic squares.at n=16A002779
- Concatenation of sequence (1, 2, ..., floor((n-1)/2), floor(n/2), floor(n/2)-1, ..., 1) for n >= 1.at n=6A007907
- How the astronomical clock ("Orloj") in Prague strikes the hours (digits follow 12343212343... (A028356), n-th group adds to n).at n=15A028354
- How the astronomical clock ("Orloj") in Prague would strike 1,2,3,...,24,25,.. (digits follow 12343212343... (A028356), n-th group adds to n).at n=15A028355
- Palindromic squares with an odd number of digits.at n=14A028817
- Palindromes whose sum of divisors is odd.at n=19A028984
- Composite numbers whose prime factors contain no digits other than 0 and 1.at n=14A036928
- Palindromes with exactly 4 palindromic prime factors (counted with multiplicity).at n=20A046378
- Squares whose consecutive digits differ by 1.at n=7A048411
- Palindromes whose square root is a palindrome.at n=12A057136
- Odd number of digits palindrome based on sequential digits.at n=3A057139
- Squares whose sum of digits as well as product of digits is a nonzero square.at n=18A061267
- Squares whose consecutive digits vary by at most 1.at n=13A061850
- Write n in binary then square as if written in base 10.at n=15A063009
- Smallest square beginning with concatenation of first n natural numbers.at n=3A068117
- Palindromic perfect powers.at n=19A075786
- Catalan paths: numbers starting with 1 and ending with 1 where each digit is positive and adjacent digits differ by 1.at n=8A079215
- Wonderful Demlo numbers A002477 whose digit sums are squares.at n=3A080162
- Repunit powers.at n=12A083278