227528

Appears in sequences

• Numerators of continued fraction convergents to sqrt(103).at n=11A041184
• Numerators of continued fraction convergents to sqrt(927).at n=7A042792
• Write fundamental unit for real quadratic field of discriminant n as x + y*omega; sequence gives values of x for n == 3 mod 4.at n=21A053372
• Composite numbers k such that (k+1)*sigma(k) is a perfect square.at n=25A073586
• a(n) is smallest natural number a satisfying Pell equation a^2 - d(n)*b^2= +1 or = -1, with d(n)=A000037(n) (a nonsquare). Corresponding smallest b(n)=A077233(n).at n=92A077232
• Let p = n-th prime of the form 4k+3, take smallest solution (x,y) to the Pellian equation x^2 - p*y^2 = 1 with x and y >= 1; sequence gives value of x.at n=13A081231
• Let p = n-th prime, take smallest solution (x,y) to the Pellian equation x^2 - p*y^2 = 1 with x and y >= 1; sequence gives value of x.at n=26A081233
• The positive fundamental solutions x = x0(n) for the Pell equation x^2 - d*y^2 = +1 with odd y = y0(n). Then d coincides with d(n) = A007970(n).at n=30A262027
• Numbers k, not powers of primes, for which A011772(k) divides A344875(k), and for all proper divisors d of k, A011772(d) < A011772(k).at n=26A344694
• Fifth Lie-Betti number of a path graph on n vertices.at n=26A364579