Cuban primes 1: Primes of the form 3y^2+3y+1.
There is 20 Cuban primes 1 smaller than 4290.
Checkout Cuban primes 1 up to: 100, 500, 1000, 10000.
7, 19, 37, 61, 127, 271, 331, 397, 547, 631, 919, 1657, 1801, 1951, 2269, 2437, 2791, 3169, 3571, 4219