143027domain: NAppears in sequencesNumbers k such that 269*2^k + 1 is prime.at n=20A053351Numbers n such that n^2 can be expressed as x^3 + y^4 with positive integers x,y and gcd(n,x,y)=1.at n=4A087210Integer solutions to n^4 = x^3 + y^2 (values of y sorted by n).at n=9A221745