36449

Appears in sequences

• Numbers k such that j(k)*phi(k) = sigma(phi(k)), j(k) = A033831(k).at n=16A033856
• Third row of Pascal-(1,7,1) array A081582.at n=34A081593
• (Product of twin primes - 1)/2.at n=17A120876
• a(1)=1, a(n)=a(n-1)+n^1 if n odd, a(n)=a(n-1)+ n^4 if n is even.at n=12A140146
• a(n) = 128*n^2 - 32*n + 1.at n=16A157331
• a(n) = 128*n^2 + 2528*n + 12481.at n=6A157436
• a(n) = 50*n^2 - 1.at n=26A157919
• Euler transform of composite numbers.at n=10A197132
• Numbers n such that n^3 contains the consecutive substring 2,3,5,7.at n=35A295900
• Numerator of best rational approximation x/y of sqrt(k), y<=k, with k given by A306972. The corresponding denominators are given in A306974.at n=34A306973
• Alternating antidiagonal sums of A047920.at n=8A347497