20369

Properties

Appears in sequences

• a(n) = a(n-1) + 3*a(n-2).at n=12A006138
• Number of bipartite polyhedral graphs with n faces.at n=9A007029
• Incorrect duplicate of A297408.at n=18A007355
• Primes such that the sum of the factorials of the digits is a perfect square.at n=32A052279
• Least prime in A031938 (lesser of primes differing by 20) whose distance to the next 20-twin is 6*n.at n=3A052359
• Primes p such that x^67 = 2 has no solution mod p.at n=35A059330
• Primes p such that 2*p+1 and ((2*p+1)^2 + 1)/2 = p^2 + (p+1)^2 are primes.at n=24A098717
• Primes p such that p^3 +- (p+1) are primes.at n=25A137472
• Prime numbers p such that p^3 - (p+1)^2 and p^3 + (p+1)^2 are both primes.at n=21A137476
• Primes congruent to 56 mod 61.at n=39A142854
• Prime numbers p such that p - 1 is the fourth a-figurate number and nineteenth b-figurate number for some a and b.at n=19A144327
• Primes p such that continued fraction of (1+sqrt(p))/2 has period 5 : primes in A146330.at n=36A146350
• Primes p such that p^3 - 12 and p^3 + 12 are also primes.at n=26A153322
• a(n) = 625n^2 - 364n + 53.at n=5A157621
• Primes p such that p^3-p-+1 are twin primes.at n=28A158295
• a(n) is the smallest prime p beginning with 2n such that the difference between p and the next prime is 2n.at n=9A162357
• Number of compositions of n where differences between neighboring parts are in {-1,1}.at n=46A173258
• Primes dividing nonzero terms in A003095: the iterates of x^2 + 1 starting at 0.at n=43A247981
• Prime numbers p such that p^3 is an interprime = average of two successive primes.at n=31A248799
• Primes p for which there are exactly as many primes in the range [p^2, p*nextprime(p)] as there are in the range [p*nextprime(p), nextprime(p)^2], where nextprime(p) gives the next prime after prime p.at n=29A256472