Numbers k such that (phi(k-2) + phi(k+2))/2 = phi(k); 2-phi/balanced numbers.

Terms

a(0) =5a(1) =10a(2) =14a(3) =20a(4) =25a(5) =50a(6) =80a(7) =154a(8) =200a(9) =434a(10) =520a(11) =610a(12) =815a(13) =1205a(14) =1345a(15) =2680a(16) =3200a(17) =3560a(18) =4669a(19) =7330a(20) =9290a(21) =10130a(22) =11705a(23) =17630a(24) =24410a(25) =25090a(26) =33385a(27) =34205a(28) =39754a(29) =39785