Numbers k such that phi(k) + phi(k+1) = k.

Terms

a(0) =14a(1) =20a(2) =44a(3) =140a(4) =254a(5) =272a(6) =284a(7) =344a(8) =464a(9) =764a(10) =1224a(11) =1424a(12) =2064a(13) =3200a(14) =3824a(15) =11648a(16) =21584a(17) =25520a(18) =27644a(19) =38840a(20) =116544a(21) =235584a(22) =603584a(23) =632400a(24) =1677024a(25) =1935344a(26) =2049984a(27) =3763184a(28) =18460224a(29) =74649584