253679

Properties

Appears in sequences

• Smaller of the first twin pair to yield a twin pair chain of length n.at n=3A068635
• Primes of the form 4*k-1 such that 8*k-1, 16*k-1 and 32*k-1 are also primes.at n=27A101795
• Primes of the form 8*k-1 such that 4*k-1, 16*k-1 and 32*k-1 are also primes.at n=20A101796
• Primes of the form 16*k-1 such that 4*k-1, 8*k-1 and 32*k-1 are also primes.at n=9A101797
• Primes of the form 8*k-1 such that 4*k-1, 16*k-1, 32*k-1 and 64*k-1 are also primes.at n=3A101996
• Primes of the form 16*k-1 such that 4*k-1, 8*k-1, 32*k-1 and 64*k-1 are also primes.at n=2A101997
• Double-safe primes which are also double-Sophie Germain primes.at n=6A162019
• Lower primes p1 in a twin pair such that sum of p1 and p2 yields average a1 of twin prime pairs and product of 2*a1 is another average of twin prime pairs.at n=2A178421
• Primes which start a Cunningham chain of length 4 where every entity of the chain is smallest of twin prime.at n=0A236443
• Primes p such that (p-k)/(k+1) is also prime for k = 1, 2, 3.at n=17A247347
• Prime numbersat n=22332