40204

Appears in sequences

• Palindromes of form k^2 + k + 4.at n=3A027717
• Palindromes that start with 4.at n=24A043039
• Palindromic even lucky numbers.at n=41A045960
• a(n) is the smallest palindrome > a(n-1) such that a(1)+a(2)+...+a(n) is a prime.at n=27A051934
• Numbers k such that k^2 contains only digits {1,3,6}.at n=12A053892
• Final terms of rows of A077529.at n=22A077530
• Beginning with 1, palindromes such that successive differences are distinct primes.at n=16A088052
• Sums of NW-SE diagonals of triangle A172171.at n=18A172172
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+161)^2 = y^2.at n=31A206426
• Let an integer with k+1 digits as n = d(k)*10^k + d(k-1)*10^(k-1) + ... + d(0)*10^0 and consider the transform T(n) = k*10^d(k) + (k-1)*10^d(k-1) + ... + 0*10^d(0). a(n) gives the fixed points of the transform T(n).at n=32A226767
• a(n) = (3*n+7)*n^2.at n=23A257042
• Number of permutations of length n and order at most 3 whose powers all avoid the pattern 132.at n=17A326763