256121

Properties

Appears in sequences

• Prime numbers of the form (x^3)/2+(3x^2)/2+3x+3.at n=19A127874
• Place n equally spaced points around the circumference of a circle and then, for each pair of points, draw two distinct circles, whose radii are the same as the first circle, such that both points lie on their circumferences. The sequence gives the total number of regions formed.at n=37A371374
• a(n) is the first prime p such that the concatenations of n consecutive primes, starting with p, in both forward and backward directions, are prime.at n=32A384958
• Prime numbersat n=22535