21799

Properties

Appears in sequences

• Number of partitions satisfying cn(1,5) + cn(4,5) <= cn(0,5) + cn(2,5) + cn(3,5).at n=40A039866
• Number of partitions satisfying cn(1,5) < cn(0,5) + cn(2,5) + cn(3,5) and cn(4,5) < cn(0,5) + cn(2,5) + cn(3,5).at n=40A039872
• Primes p such that x^36 = 2 has no solution mod p, but x^12 = 2 has a solution mod p.at n=29A059668
• a(1) = 2 then primes in nondecreasing order such that every concatenation is prime.at n=38A089702
• Primes congruent to 28 mod 59.at n=39A142755
• Smaller member of a pair (p,q) of cousin primes such that p and q are in different centuries.at n=22A160440
• Primes p such that 2*p^3-+15 are also prime.at n=27A174364
• Primes p such that sod(p)=2*sod(nextprime(p)).at n=37A175546
• Primes p such that both (p^2 + 5)/6 and (p^4 + 5)/6 are prime.at n=16A253925
• Primes p(n) such that p(n) + p(n+3) = p(n+1) + p(n+2) and p(n) + p(n+4) = p(n+2) + p(n+3).at n=18A266882
• a(n) is the least number such that d(a(n)) = d(R(a(n)))/n, where R(n) is the digit reverse of n and d(n) is the number of divisors of n.at n=15A284495
• Positive-pan primes (see Comments).at n=35A332788
• Number of compositions (ordered partitions) of n into at most 6 nonprime parts.at n=40A347799
• Prime numbersat n=2445