31923

Appears in sequences

• Number of numbers below 10^n with nonzero multiplicative digital root 8.at n=4A051828
• Numbers n such that x^n + x^5 + x^4 + x^3 + x^2 + x + 1 is irreducible over GF(2).at n=57A057484
• a(n) = T(n) concatenated with reverse(T(n)) divided by 11, where T(n) is the n-th triangular number.at n=26A084008
• Numbers n such that (n+j) mod (2+j) = 1 for j from 0 to 6 and (n+7) mod 9 <> 1.at n=25A096025
• G.f.: 1/sqrt(1 - 6*x - 55*x^2).at n=5A322244