20593

Properties

Appears in sequences

• Primes of form k^2 + k + 1.at n=41A002383
• Sextan primes: p = (x^6 + y^6)/(x^2 + y^2).at n=27A002647
• a(n) = largest prime factor of n^n - 1.at n=10A006486
• Incorrect duplicate of A297408.at n=19A007355
• Cyclotomic polynomials at x=12.at n=12A019330
• Cyclotomic polynomials at x=-12.at n=12A020511
• Primes p whose period of reciprocal equals (p-1)/11.at n=6A056216
• Number of primitive (aperiodic) palindromic structures using a maximum of six different symbols.at n=18A056480
• a(n) = n^4 - n^2 + 1.at n=12A060886
• a(n) = floor(e^(n/e)).at n=27A061481
• Value of n-th cyclotomic polynomial at n.at n=11A070518
• Prime numbers of form p=Cyclotomic(n,n).at n=5A070520
• Primes of the form 4*k^2 - 10*k + 7 with k positive.at n=24A073337
• Numbers k such that k^4 = x^3 + y^2 has an integer solution.at n=42A096741
• Duplicate of A056216.at n=6A098678
• Minimal set in the sense of A071062 of prime-strings in base 12 for primes of the form 4n+1.at n=30A111057
• Primes of the form 18k+1 generated recursively. Initial prime is 19. General term is a(n) = Min {p is prime; p divides (R^9 - 1)/(R^3 - 1); p == 1 (mod 9)}, where Q is the product of previous terms in the sequence and R = 3*Q.at n=1A125043
• Primes p that divide Fibonacci[(p+1)/7].at n=26A125252
• Smallest prime divisor of n^4-n^2+1.at n=10A125258
• Records in A134204.at n=33A133244