91921

Properties

Appears in sequences

• Primes for which only three iterations of 'Prime plus its digit sum equals a prime' are possible.at n=21A048525
• Prime numbers p such that pi(p) + 2*p is a square.at n=27A104783
• Primes of the form x^2 + 18480*y^2.at n=27A173274
• Number of n X 2 0..1 arrays with no element less than a strict majority of its horizontal and vertical neighbors.at n=12A231376
• Primes of the form 2*n^2+30*n+13.at n=19A243889
• Prime numbersat n=8879