75078
domain: N
Appears in sequences
- z-value of the solution (x,y,z) to 5/n = 1/x + 1/y + 1/z satisfying 0 < x < y < z and having the largest z-value. The x and y components are in A075249 and A075250.at n=40A075251
- Triangular numbers for which the sum of the digits is a cube.at n=25A117803
- Cyclops triangular numbers.at n=16A160717
- Triangular numbers of the form k^2 + 2.at n=6A214838
- Triangular numbers which are an average of four consecutive primes.at n=35A226196
- Triangular numbers which become primes when their rightmost digit is removed.at n=42A227936
- Triangular numbers representable as b! + c^2.at n=38A230364
- Numbers k such that (28*10^k + 131)/3 is prime.at n=28A282815
- G.f. A(x) satisfies: A(x) = Product_{k>=1} 1/(1 - k*x^k*A(x)).at n=9A302288
- Triangular numbers that are the sum of two distinct nonzero triangular numbers in exactly two ways.at n=19A350368