33227

Appears in sequences

• a(n+6) = -a(n+5) + a(n+4) + 3a(n+3) + a(n+2) - a(n+1) - a(n). a(n) = sign(n) if abs(n)<=3.at n=37A001945
• Pseudoprimes to base 7.at n=40A005938
• Number of paraffins.at n=51A005999
• Strong pseudoprimes to base 17.at n=20A020243
• Strong pseudoprimes to base 26.at n=14A020252
• Strong pseudoprimes to base 28.at n=15A020254
• Strong pseudoprimes to base 30.at n=20A020256
• Strong pseudoprimes to base 33.at n=14A020259
• Strong pseudoprimes to base 49.at n=16A020275
• Strong pseudoprimes to base 54.at n=18A020280
• Least number k such that phi(k) / Carmichael lambda(k) = 2n.at n=36A066497
• Polynomial (1/3)*n^3 + (9/2)*n^2 + (85/6)*n - 2.at n=42A073775
• Pseudoquadprimes: p+4 for primes p where p+4 divides p^(p+4) + 4 and p+4 is composite.at n=12A100875
• Pentagonal numbers (A000326) that are also brilliant numbers (A078972).at n=7A113941
• Pentagonal numbers with prime indices.at n=34A116995
• Pentagonal numbers (A000326) which are the sum of 2 other positive pentagonal numbers.at n=36A136117
• Smallest product of two distinct primes of the form n*k+1.at n=36A194265
• Semiprimes of the form n*(3*n-1)/2.at n=21A245365
• Semiprimes of the form (4*n + 1)*(6*n + 1) = 24*n^2 + 10*n + 1.at n=8A255584
• Number of 3-generalized Motzkin paths of length n with no level steps H=(3,0) at odd level.at n=20A257389