21181

Appears in sequences

• Multiplicity of highest weight (or singular) vectors associated with character chi_159 of Monster module.at n=40A034547
• Numbers k such that k*2^m+1 are composites for all exponents m in the range 0<=m<=k.at n=38A061153
• a(n) = Bell(n) + Fibonacci(n).at n=9A100388
• Composite numbers k such that sigma(k + sigma(k)) = 2*sigma(k).at n=24A246858
• Row sums of the triangle A322071.at n=19A322072
• Numbers k such that 441*2^k+1 is prime.at n=27A323149