353501domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumbers k such that (7^k - 3^k)/4 is prime.at n=11A128024Irregular triangle T(n,k) read by rows in which row n lists the numbers m such that the number of prime numbers <= m is equal to the number of base-n zerofree numbers <= m.at n=46A324156Prime numbersat n=30252