27379

Appears in sequences

• Numerators of continued fraction convergents to sqrt(10).at n=6A005667
• Strong pseudoprimes to base 32.at n=31A020258
• Strong pseudoprimes to base 45.at n=9A020271
• Numbers whose square with its last digit deleted is also a square.at n=22A031149
• Numerators of continued fraction convergents to sqrt(40).at n=5A041066
• Numerators of continued fraction convergents to sqrt(90).at n=5A041160
• Numerators of continued fraction convergents to sqrt(360).at n=5A041682
• Numerators of continued fraction convergents to sqrt(810).at n=7A042562
• Chebyshev T(n,19) polynomial.at n=3A078986
• Duplicate of A005667.at n=6A084133
• A weighted tribonacci, (1,2,4).at n=11A102001
• Expansion of g.f. x*(1+x+2*x^2+2*x^3+5*x^4+5*x^5-3*x^6+2*x^7-x^8-x^9)/(1-6*x^6-x^12).at n=37A116559
• a(n) = ChebyshevT(3, n).at n=19A144129
• a(n) = (n+3)^2*n/2 + 1.at n=36A154560
• a(n) = 18*n^2 + 1.at n=38A157889
• a(n) = 20*n^2 - 1.at n=36A158491
• a(n) = cosh(2*n*arcsinh(n)).at n=3A173128
• Numbers k such that sum_{i=1..k} d(i)^2 is a square c^2, where d(i) is the number of divisors of i.at n=17A186429
• Array of ((k^n)+(k^(-n)))/2 where k=(sqrt(x^2+1)+x)^2 for integers x>=1.at n=17A188645
• a(n) + a(n+2) = n^3.at n=38A206481