Numbers k such that phi(P(k)) - P(phi(k)) = 1, where P(k) is the largest prime factor of k.

Terms

a(0) =45a(1) =90a(2) =135a(3) =175a(4) =180a(5) =270a(6) =350a(7) =360a(8) =405a(9) =525a(10) =540a(11) =700a(12) =720a(13) =810a(14) =875a(15) =1050a(16) =1080a(17) =1215a(18) =1400a(19) =1440a(20) =1573a(21) =1575a(22) =1620a(23) =1750a(24) =2100a(25) =2160a(26) =2430a(27) =2625a(28) =2800a(29) =2880