52021

Properties

Appears in sequences

• a(n) = n^3 + n^2 - 1.at n=36A003777
• Numerators of continued fraction convergents to sqrt(190).at n=13A041352
• Numerators of continued fraction convergents to sqrt(760).at n=9A042464
• Write fundamental unit for real quadratic field of discriminant n as x + y*omega; sequence gives values of x for n == 2 mod 4.at n=39A053371
• a(n) = prime(n)^1 + prime(n-1)^2 + prime(n-2)^3 + ... + prime(1)^n.at n=7A090831
• Balanced primes of order eleven.at n=19A096703
• Least j > 1 for n > 0 such that j^2 = (n^2 + 1)*(k^2) + (n^2 + 1)*k + 1 where k sequence = A106230.at n=37A106229
• Number of minimally strongly connected digraphs on n vertices, up to isomorphism.at n=9A130756
• Primes of the form 5k^2 + 1.at n=5A137530
• Primes in A090831.at n=3A144676
• Primes p of the form : p+p^2+p^3-+4=prime.at n=16A154822
• Primes where the first digit equals the sum of all the other digits.at n=35A156307
• a(n) = 38*n^2 - 1.at n=36A158596
• Primes p such that q=2*p^2-1, r=2*p*q-1 and 2*p*r-1 are also prime.at n=2A224991
• Values k(i) such that k(i) + k(i+3) = k(i+1) + k(i+2), where k(i) is A022885(i).at n=17A235725
• Prime numbers p such that all prime factors of p+1 and p-1 are smaller than the cube root of p.at n=24A283791
• Number of permutations of [n] avoiding {1324, 2413, 2431}.at n=10A294824
• A331757(n)/2.at n=23A331758
• a(n) = Sum_{1 <= i, j <= n} gcd(i, j, n)^3.at n=36A368743
• Prime numbersat n=5321