Numbers k such that k and k+1 are both phi-practical numbers (A260653).

Terms

a(0) =1a(1) =2a(2) =3a(3) =15a(4) =255a(5) =735a(6) =2624a(7) =3135a(8) =4095a(9) =4784a(10) =5264a(11) =5984a(12) =7215a(13) =7424a(14) =7904a(15) =9344a(16) =10064a(17) =10335a(18) =10815a(19) =11024a(20) =11984a(21) =12375a(22) =12495a(23) =13695a(24) =16184a(25) =16575a(26) =22575a(27) =22784a(28) =22815a(29) =26144