20902

Appears in sequences

• Base-10 palindromes that start with 2.at n=31A043037
• Palindromic even numbers with an odd number of distinct prime factors.at n=25A075809
• Palindromic even numbers with exactly 3 prime factors (counted with multiplicity).at n=28A075816
• a(n) is the odd-length palindrome whose digits up to the center are those of n and whose center digit is equal to the digital root of the product of the factorial of n and the reverse of n.at n=19A082941
• Palindromes in A085932.at n=10A085933
• Palindromic numbers with property that sum of digits is prime and number of prime digits is prime.at n=29A093807
• Dates after Jan 01 00 in chronological order which are palindromic when they are written in the format D.M.YY. The terms are listed as numbers (without the dots).at n=18A210890
• Dates after Jan 01 00 in chronological order which are palindromic when they are written in the format D.M.YY. The terms are listed as numbers. Leading zeros of the terms are suppressed.at n=18A210892
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 822", based on the 5-celled von Neumann neighborhood.at n=33A272847
• a(n) = (Sum_{i=1..n-1} i^(n-2)) mod n^3.at n=27A284759
• a(n) = 2*a(n-1) - a(n-3) for n >= 5, a(0) = 2, a(1) = 4, a(2) = 7, a(3) = 12, a(4) = 22.at n=18A289107
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n) - 1, where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 4, b(2) = 5, and (a(n)) and (b(n)) are increasing complementary sequences.at n=17A295960
• O.g.f. A(x) satisfies: [x^n] exp( x*A(x) ) * (n^2 + 1 - A(x)) = 0 for n >= 0.at n=5A305114
• Palindromes (A002113) in A157037.at n=37A353703
• Palindromes that can be written as the sum of two palindromic primes.at n=33A356824
• a(n) is the sum of all symmetric valleys in the set of flattened Catalan words of length n.at n=7A372878