Numbers k that divide the average of prime(k-1) and prime(k+1).

Terms

a(0) =4a(1) =5a(2) =11a(3) =12a(4) =70a(5) =72a(6) =1053a(7) =6459a(8) =6460a(9) =40083a(10) =251742a(11) =637320a(12) =637322a(13) =637330a(14) =10553828a(15) =69709721a(16) =179992913a(17) =179992922a(18) =465769813a(19) =1208198617a(20) =1208198629a(21) =3140421742a(22) =3140421769a(23) =3140421866a(24) =8179002192a(25) =8179002205a(26) =8179002209