Numbers n such that phi(n) + pi(n) = n+1.

Terms

a(0) =3a(1) =9a(2) =55a(3) =65a(4) =95a(5) =145a(6) =155a(7) =185a(8) =205a(9) =2779a(10) =2863a(11) =21199a(12) =174691a(13) =174779a(14) =1277809a(15) =1301989a(16) =1302457a(17) =1930091a(18) =2554873a(19) =8170013a(20) =70111213a(21) =70111247a(22) =514269523a(23) =514269599a(24) =27788312339a(25) =341964217733a(26) =358200797989a(27) =763730325367