18013

Properties

Appears in sequences

• Reflectable emirps.at n=20A007628
• a(n) = [ a(n-1)/a(1) + a(n-3)/a(3) + a(n-5)/a(5) + ... ], for n >= 3.at n=31A022865
• The sequence e when b=[ 1,0,1,1,1,... ].at n=41A042953
• Primes setting records for earliest alphabetical position in American English.at n=9A050444
• prime(k) for those k where floor((2*(prime(k+1)-prime(k))*PrimePi(k) mod (8*k))/k) = m with m = 8.at n=34A109562
• Indices of records in A109631.at n=32A109640
• Primes p such that q-p = 28, where q is the next prime after p.at n=15A124595
• Primes p such that p - q = 24, where q is the previous prime before p; or prime numbers preceded by precisely 23 composite numbers.at n=29A126720
• Sum of n and partition number of n.at n=36A133041
• Prime numbers, isolated from neighboring primes by >14.at n=29A137874
• Prime numbers, isolated from neighboring primes by >16.at n=15A137875
• Primes p such that the left prime neighbors p1, p2 of p as well as the right prime neighbors q1, q2 of p form twin prime pairs and the sum p1 + p2 + p + q1 + q2 is also prime.at n=18A138396
• Primes congruent to 46 mod 53.at n=38A142576
• Primes congruent to 18 mod 59.at n=40A142745
• Primes congruent to 18 mod 61.at n=35A142816
• Lesser of two Pythagorean primes for which the Pythagorean triangles have the same area.at n=13A157184
• Honaker emirps: terms in A033548 that are emirps.at n=27A161118
• Prime numbers with gaps larger than 18 towards both neighboring primes.at n=6A163111
• Prime numbers with gaps larger than 20 towards both neighboring primes.at n=2A163112
• Primes p = prime(k) of form 13//r, s//13 or t//13//u and sod(p) = sod(k).at n=21A169645