65689

Appears in sequences

• 24 'Reverse and Add' steps are needed to reach a palindrome.at n=33A065318
• Indices of prime numbers in A014260.at n=21A101762
• E.g.f. satisfies: A(x)+1/2*A(x)^2 = x*exp(A(x)).at n=7A201795
• Number of (n+1) X (n+1) -9..9 symmetric matrices with every 2 X 2 subblock having sum zero and one or two distinct values.at n=17A211549
• a(0) = 1; a(n) = Sum_{k=0..floor(n/4)} binomial(n,4*k) * a(k).at n=18A351971
• Numbers k for which A354102(k) = A354102(sigma(k)).at n=38A354106