80138

Appears in sequences

• Decimal part of a(n)^(1/4) starts with a 'nine digits' anagram.at n=22A034279
• Numbers k such that 90*R_k + 1 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=17A056696
• a(n) = ((n+2)/2)*Sum_{k=0..n/2} (Sum_{i=0..n-2*k} (binomial(k+1,n-2*k-i)*binomial(k+i,k))*F(k+1)/(k+1)), where F(k) is Fibonacci numbers.at n=15A270737
• p-INVERT of (1,1,0,0,0,0,...), where p(S) = 1 - 2 S + S^3.at n=12A291414