31861

Appears in sequences

• Expansion of 1/((1-3x)*(1-6x)*(1-10x)).at n=4A017952
• Strong pseudoprimes to base 19.at n=23A020245
• Strong pseudoprimes to base 23.at n=18A020249
• Smallest k>1 such that k(p-1)-1 is divisible by p^2, p=n-th prime.at n=40A039914
• Denominators of continued fraction convergents to sqrt(220).at n=9A041411
• Denominators of continued fraction convergents to sqrt(880).at n=9A042701
• Squarefree conductors of quintic fields.at n=20A085715
• p^2-p-1 that is not prime, where p is prime.at n=23A119609
• Partial sums of A138202.at n=33A164940
• Numbers n of the form p^2-p-1 = A165900(p), for prime p, such that n^2-n-1 = A165900(n) is also prime.at n=9A237527
• a(n) = p^2 - p - 1 where p = prime(n), the n-th prime.at n=40A306190
• Numbers k such that k, k+1, k+2, k+3 have 2, 3, 4, 5 prime factors respectively, counted with multiplicity.at n=42A363391