20731

Properties

Appears in sequences

• Primes of form k^2 - 5.at n=28A028877
• Initial terms of '4-block' primes as described in A032591.at n=31A032592
• Primes p such that p-12, p and p+12 are consecutive primes.at n=20A053072
• Primes p such that p+5==0 (mod phi(p+5)).at n=33A067542
• Primes in which the unit place digit is 1 and the k-th most significant digit is prime (2,3,5,7) if k is prime else is composite (4,6,8,9,0).at n=29A089704
• Numbers p such that p = (prime(n)+ prime(n+2))/2 is prime for prime indices n=2, 3, 5...at n=23A098038
• Primes congruent to 22 mod 59.at n=36A142749
• Primes congruent to 52 mod 61.at n=38A142850
• Primes p of the form : p+p^2+p^3-+4=prime.at n=7A154822
• Largest prime < n^4.at n=10A173831
• Primes p such that reversal(p) - 13 is a square.at n=23A176371
• Primes of the form k^4 - 5.at n=4A182350
• Primes of the form 9n^2 - 5.at n=9A201960
• Balanced primes which are the average of two successive semiprimes.at n=19A212820
• Primes p such that q = 2*p^2 - 1 and 2*p*q - 1 are also prime.at n=37A224990
• Number of partitions p of n such that m(p) <= m(c(p)), where m = minimal multiplicity of parts, and c = conjugate.at n=36A240730
• Prime time primes on 6-digit clocks, second definition: primes of the form HMMSS where H, MM, SS are primes, H < 24, MM and SS < 60.at n=15A295013
• Prime(r) for r such that prime(r) - prime(r-1) = 12 and prime(r-1) - prime(r-2) = 2.at n=49A299110
• Balanced primes of order one ending in 1.at n=16A303092
• Number of compositions (ordered partitions) of n into distinct prime powers (1 excluded).at n=43A331847