204331

Properties

Appears in sequences

• a(n) = (n^5 - 133*n^4 + 6729*n^3 - 158379*n^2 + 1720294*n - 6823316)/4.at n=35A121887
• Primes p such that p+2, p+4, p+6, p+8, p+10 and p+12 are all semiprime.at n=13A241483
• Primes p such that p+2, p+4, p+6, p+8, p+10 are semiprimes.at n=30A241959
• Centered 21-gonal primes.at n=28A276261
• Beginning with 13, least prime such that concatenation of first n terms and its digit reversal both are primes.at n=43A382898
• Prime numbersat n=18328