637321

Properties

Appears in sequences

• Numbers k such that prime(k) == 2 (mod k).at n=6A023144
• Values of transition of A072608(n) from alternating behavior (0,1,0,1,..) into steadily-1 (1,1,1,..) behavior or changing back. Expressing in terms of A072609(n): at n values it switches from steadily 0 into steadily 1 successive values or back.at n=32A072610
• Positive integers n such that the difference between the n-th prime and the sum of the divisors of n is congruent to 1 (mod n).at n=18A111359
• Primes p such that prime(p)=2 (mod p), where prime(p)=A000040(p) is the p-th prime.at n=3A156154
• Primes p such that A066272(p)*p+1 is also prime, where A066272 is the number of anti-divisors.at n=16A209271
• Least positive integer m with pi(m*n) = phi(m), where pi(.) is the prime-counting function and phi(.) is Euler's totient function.at n=14A247601
• Least integer k > 0 such that prime(k) - k*n is prime.at n=14A247895
• Primes whose anti-divisors sum to a prime.at n=36A259932
• Upper twin primes which correspond to the hypotenuse in a Pythagorean triple whose short leg is also a prime.at n=17A284035
• Hypotenuses of primitive Pythagorean triangles two sides of which are Pythagorean primes.at n=17A308341
• Prime numbersat n=51892