19141

Properties

Appears in sequences

• Quintan primes: p = (x^5 + y^5)/(x + y).at n=18A002650
• a(n) = (1 - (-12)^n)/13.at n=4A014994
• Triangle of q-binomial coefficients for q=-12.at n=16A015125
• Triangle of q-binomial coefficients for q=-12.at n=19A015125
• Gaussian binomial coefficient [ n,4 ] for q = -12.at n=1A015302
• a(n) = 11*a(n-1) + 12*a(n-2).at n=5A015609
• Cyclotomic polynomials at x=12.at n=10A019330
• Cyclotomic polynomials at x=-12.at n=5A020511
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 84 ones.at n=16A031852
• Let (p1,p2), (p3,p4) be pairs of twin primes with p1*p2=p3+p4-1; sequence gives values of p2.at n=21A047977
• a(n) = n^4 - n^3 + n^2 - n + 1.at n=12A060884
• Smallest prime of the form (n^k+1)/(n+1), or 0 if no such prime exists.at n=10A084741
• a(n) = if Floor[(2*Pi/E)*m^2] is prime then Floor[(2*Pi/E)*m^2].at n=9A090434
• Minimal set in the sense of A071062 of prime-strings in base 12 for primes of the form 4n+1.at n=29A111057
• Primes p such that p+1, p+2 and p+3 have equal number of divisors.at n=22A119711
• Primes p such that p+1, p+2, p+3 and p+4 have equal number of divisors.at n=2A119728
• Primes p such that p+1, p+2, p+3, p+4 and p+5 have equal number of divisors.at n=1A119730
• Primes congruent to 25 mod 59.at n=37A142752
• Primes congruent to 48 mod 61.at n=35A142846
• Primes in A005891 = Centered pentagonal numbers: (5n^2 + 5n + 2)/2.at n=16A145838