390223domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of simple perfect squared rectangles of order n up to symmetry.at n=18A002839a(n) = ceiling(A117791(n)/2).at n=34A173696Primes of the form 2*k^3-1.at n=14A177105Number of nonsquare simple perfect squared rectangles of order n up to symmetry.at n=18A219766Prime numbersat n=33087