18429

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 90.at n=36A031588
• Denominators of continued fraction convergents to sqrt(740).at n=6A042425
• Let u(1)=u(2)=1, u(3)=n, u(k) = (1/2)*abs(2*u(k-1) -u(k-2)-u(k-3)); sequence gives values of n such that Sum_{k>=1} u(k) is an integer.at n=23A078113
• a(1)=a(2)=1, a(n)=a(n-1)+a(n-2) if n is odd, a(n)=a(n-1)+a(n/2) if n is even.at n=26A078912
• Semiprimes in A054556.at n=19A113693
• Numbers such that n^2 = 29 mod 1193.at n=30A165989
• a(n) = Sum_{i=0..n} digsum_3(i)^4, where digsum_3(i) = A053735(i).at n=58A231505
• Number of partitions p of n such that the number of distinct parts is a part and max(p) - min(p) is a part.at n=50A241387
• Numbers n such that n*2^2203 - 1 is prime.at n=22A265503
• G.f. satisfies: A(x) = x + A( A(x)^3 + A(x)^4 ).at n=13A323692
• a(n) = n*2^10 - 3.at n=17A362361