a(n) is the smallest k > n such that psi(k) is the arithmetic mean of psi(k - n) and psi(k + n), or 0 if no such k exists.

A292307

a(n) is the smallest k > n such that psi(k) is the arithmetic mean of psi(k - n) and psi(k + n), or 0 if no such k exists.

Terms

    a(0) =15a(1) =5a(2) =26565a(3) =7a(4) =315a(5) =11a(6) =15a(7) =11a(8) =79695a(9) =13a(10) =15a(11) =17a(12) =75a(13) =17a(14) =56815934175a(15) =22a(16) =45a(17) =23a(18) =75a(19) =23a(20) =7767045a(21) =55a(22) =45a(23) =29a(24) =189a(25) =38a(26) =5005a(27) =31a(28) =75a(29) =37

External references