139921

Properties

Appears in sequences

• Half-quartan primes: primes of the form p = (x^4 + y^4)/2.at n=30A002646
• The terms of A073215 (sums of two powers of 23) divided by 2.at n=10A072822
• Largest prime dividing sigma(4,n).at n=21A078553
• Primes of the form (k^4 + 1)/2.at n=7A096170
• Largest prime factor of n^4 + 1.at n=22A096172
• Numbers k such that phi(k) + k is a fourth power.at n=35A114072
• a(n) = ceiling((n+1)^4/2).at n=22A171714
• a(n) = ((2*n+1)^4+1)/2.at n=11A175110
• Number of primes of the form 1 + b^128 for 1 < b < 10^n.at n=7A215058
• Primes p such that sigma(2p-1) is a prime q.at n=9A247789
• Numbers k such that sigma(2*k-1) is a prime p.at n=18A247820
• Primitive prime factors of the cyclotomic polynomial sequence Phi(8,k) in the order in which they occur.at n=25A256145
• Centered 11-gonal (or hendecagonal) primes.at n=25A262344
• Number of partitions of n^4 into at most two parts.at n=23A274323
• Primes of the form (p^4 + 1)/2, where p is prime.at n=6A277201
• Balanced primes of order fourteen.at n=28A300365
• Primes of the form (p^k+1)/2 where p is prime and k > 1.at n=27A308442
• Prime numbersat n=13002