176149

Appears in sequences

• Strong pseudoprimes to base 74.at n=37A020300
• Strong pseudoprimes to base 91.at n=31A020317
• Pseudoprimes to both base 2 and base 3, i.e., intersection of A001567 and A005935.at n=30A052155
• The (1,1)-entry in the 3 X 3 matrix M^n, where M = [1,2,1 / 2,2,0 / 1,0,0].at n=9A100191
• Zsigmondy numbers for a = 7, b = 5: Zs(n, 7, 5) is the greatest divisor of 7^n - 5^n that is relatively prime to 7^m - 5^m for all positive integers m < n.at n=8A109349
• Expansion of g.f.: x^2*(1-2*x) / (1-3*x-3*x^2+2*x^3).at n=11A123950
• Composite numbers k such that 2^k-2 and 3^k-3 are both divisible by k and k is not a Carmichael number (A002997).at n=11A153513
• Numbers m such that exactly half of the a such that 0<a<m and (a,m)=1 satisfy a^(m-1) == 1 (mod m).at n=28A191311
• Numbers in A191311 but not in A129521.at n=14A191592
• Odd non-Carmichael numbers with increasing numbers of bases to which they are pseudoprimes.at n=29A194946
• Pseudoprimes divisible by a smaller pseudoprime.at n=14A215150
• Fermat pseudoprimes to base 2 with three prime factors divisible by a smaller Fermat pseudoprime to base 2.at n=3A215944
• Odd numbers k > 1 such that 2^((k-1)/2) == -(2/k) = -A091337(k) (mod k), where (2/k) is the Jacobi (or Kronecker) symbol.at n=9A306310