26821

Properties

Appears in sequences

• Primes that are palindromic in base 12.at n=39A029979
• a(0)=1, a(1)=1, a(n) = largest prime <= a(n-1) + a(n-2).at n=23A055500
• a(0)=1, a(1)=2, a(n) = largest prime < a(n-1)+a(n-2).at n=24A055501
• Primes p such that the number of primes less than p equal to 1 mod 4 is two less than the number of primes less than p equal to 3 mod 4.at n=35A096451
• a(n) = numerator of b(n), where b(1)=1, b(n+1) = sum{k|n} 1/b(k).at n=10A127939
• a(n) = denominator of b(n), where b(1)=1, b(n+1) = sum{k|n} 1/b(k).at n=11A127940
• Primes in the sequence A003294 of certain fourth powers bases.at n=21A134820
• Number of parts > 1 in the last section of the set of partitions of n.at n=36A138135
• Number of parts in all partitions of 2n+1 that do not contain 1 as a part.at n=18A182735
• Primes p such that p = 361 + 420*k for some k.at n=25A217656
• Primes p such that 10p + 1, 100p + 1 and 1000p + 1 are also primes.at n=27A243962
• Primes p such that p+12, (p+1)/2, and (p+13)/2 are also prime.at n=16A283869
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(1) + b(2) + ... + b(n-1), where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences.at n=16A295054
• Primes p such that A001175(p) = (p-1)/6.at n=31A308791
• Primes p such that A001177(p) = (p-1)/6.at n=36A308799
• Prime numbersat n=2942