18719

Properties

Appears in sequences

• Primes p such that p, p+12, p+24 are consecutive primes.at n=15A052188
• Prime numbers that are 2 less than a prime-indexed odd triangular number or 1 more than a prime-indexed even triangular number.at n=26A096333
• Start of seven consecutive primes whose digit reversals are also prime.at n=8A103169
• Chen primes p such that p + 2 is triangular.at n=12A109504
• Chen primes p such that their p + 2 counterpart is a Sarrus number (pseudoprime to base 2).at n=4A109994
• Sequence of Chen primes of the form (x*n+1)*(y*n+1)-2 in the order generated by A112229.at n=31A112230
• Least prime p such that sigma(x)=sigma(p) has exactly n solutions.at n=37A115374
• Start with 1 and repeatedly reverse the digits and add 38 to get the next term.at n=35A118634
• Primes p such that p^3 +- (p+1) are primes.at n=24A137472
• Primes congruent to 10 mod 53.at n=39A142540
• Primes congruent to 16 mod 59.at n=34A142743
• Primes congruent to 53 mod 61.at n=36A142851
• Primes p such that (p-7)/8 and 8p + 7 are both prime.at n=20A158238
• Primes of the form p + (p^2 - 1)/8, where p is also prime.at n=19A165352
• Partial sums of floor(2^n/7).at n=16A178455
• The largest number m such that sigma(m) = A007368(n), where A007368(n) = the smallest k such that sigma(x) = k has exactly n solutions.at n=37A184394
• Primes of the form 8*k^2 + 6*k - 1 for positive k.at n=26A187677
• Lesser of pseudo twin primes to base 2.at n=16A192297
• Primes of the form 3*m^2 - 4.at n=20A201716
• Number of zero-sum -n..n arrays of 4 elements with first through third differences also in -n..n.at n=28A202512