Numbers m such that m, m' and m'' are in arithmetic progression, where m' and m'' are the first and second arithmetic derivatives of m.

A212409

Numbers m such that m, m' and m'' are in arithmetic progression, where m' and m'' are the first and second arithmetic derivatives of m.

Terms

    a(0) =2a(1) =4a(2) =8a(3) =27a(4) =54a(5) =156a(6) =380a(7) =476a(8) =782a(9) =861a(10) =1053a(11) =1976a(12) =2542a(13) =2565a(14) =3125a(15) =3213a(16) =3368a(17) =6250a(18) =8732a(19) =13338a(20) =13724a(21) =22734a(22) =42716a(23) =46136a(24) =51640a(25) =56156a(26) =56444a(27) =58941a(28) =64796a(29) =67196

External references