52147

Properties

Appears in sequences

• Numbers n such that 2*10^n+11 is prime.at n=20A086865
• Primes p such that p-+1, p-+3, p-+5 are not squarefree.at n=12A155145
• Place n equally spaced points on each side of an equilateral triangle, and join each of these points by a chord to the 2*n new points on the other two sides: sequence gives number of regions in the resulting planar graph.at n=13A366486
• Prime numbersat n=5331