819509

Properties

Appears in sequences

• Primes that remain prime through 4 iterations of function f(x) = 2x + 1.at n=31A023302
• Initial (unsafe) primes of Cunningham chains of first type with length exactly 5. Primes in A059453 that survive as primes just four "2p+1 iterations", forming chains of exactly 5 terms.at n=22A059764
• Place n equally spaced points on each side of a square, and join each of these points by a chord to the 3*n new points on the other three sides: sequence gives number of interior vertices in the resulting planar graph.at n=19A367277
• Prime numbersat n=65380