a(n) = x^2 = A090116(n)^2 is the least square that is "surrounded" by two closest primes, by prevprime(x^2) and nextprime(x^2) whose difference nextprime - prevprime = 2n.
A090117
a(n) = x^2 = A090116(n)^2 is the least square that is "surrounded" by two closest primes, by prevprime(x^2) and nextprime(x^2) whose difference nextprime - prevprime = 2n.
Terms
- a(0) =4a(1) =9a(2) =25a(3) =361a(4) =144a(5) =625a(6) =121a(7) =1936a(8) =529a(9) =900a(10) =3249a(11) =1681a(12) =2500a(13) =10404a(14) =5776a(15) =10816a(16) =10000a(17) =22201a(18) =30625a(19) =25281a(20) =121104a(21) =76176a(22) =93025a(23) =157609a(24) =212521a(25) =35721a(26) =119025a(27) =1121481a(28) =190969a(29) =672400
External references
- oeis: A090117