Lucky numbers that are decimal concatenations of n with n + 3.

Terms

a(0) =25a(1) =69a(2) =1417a(3) =2023a(4) =2427a(5) =3235a(6) =4851a(7) =5053a(8) =6669a(9) =6871a(10) =7881a(11) =8487a(12) =108111a(13) =120123a(14) =128131a(15) =134137a(16) =146149a(17) =156159a(18) =162165a(19) =200203a(20) =210213a(21) =218221a(22) =224227a(23) =228231a(24) =254257a(25) =266269a(26) =270273a(27) =284287a(28) =290293a(29) =306309