2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/103684We proved that any even number not less than 6 can be expressed as the sum of two old primes, $2n=p_i+p_j$16 pages, 1 figureGeneral Mathematics11A41; 11P32; 11N36There is at least one pair of double primes for any even numbertext