44244

Appears in sequences

• Numbers having four 4's in base 10.at n=10A043508
• a(n) = smallest palindrome > a(n-1) such that a(1)*a(2)*...*a(n) + 1 is prime with a(1) = 2.at n=30A051896
• Palindromes which are the concatenation of 3 or more terms of an arithmetic sequence with nonzero difference.at n=1A062564
• Numbers that are palindromic in base 2 as well as in base 10 (initial zeros may be prepended).at n=50A069024
• G.f.: A(x) = (A_1)^2 where A_1 = 1/[1 - x*(A_2)^2], A_2 = 1/[1 - x^2*(A_3)^2], A_3 = 1/[1 - x^3*(A_4)^2], ... A_n = 1/[1 - x^n*(A_{n+1})^2] for n>=1.at n=14A132333
• Palindromes of the form i^2 + reverse(i)^2.at n=14A256398
• Palindromic numbers such that the sum of the digits equals the number of divisors.at n=21A263720
• a(n) = 4*(10^(2*n+1)-1)/9 - 2*10^n.at n=2A332142
• Numbers with all digits even whose squares have all but one digit odd.at n=15A343728
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where A(n,k) = n! * k! * [x^n * y^k] 1 / ( (1-x) * (1-y) * (1 - log(1-x) * log(1-y))^3 ).at n=37A382825
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where A(n,k) = n! * k! * [x^n * y^k] 1 / ( (1-x) * (1-y) * (1 - log(1-x) * log(1-y))^3 ).at n=43A382825