Composites c whose decimal expansion ends with its largest prime factor.

Terms

a(0) =15a(1) =25a(2) =32a(3) =45a(4) =75a(5) =125a(6) =135a(7) =147a(8) =225a(9) =243a(10) =375a(11) =405a(12) =512a(13) =567a(14) =625a(15) =675a(16) =1125a(17) =1215a(18) =1875a(19) =2025a(20) =3087a(21) =3125a(22) =3375a(23) =3645a(24) =5625a(25) =6075a(26) =8192a(27) =9375a(28) =10125a(29) =10935