a(n) is the smallest k different from n such that (n, k) is a Harshad amicable pair (see the comments).

A272479

a(n) is the smallest k different from n such that (n, k) is a Harshad amicable pair (see the comments).

Terms

    a(0) =10a(1) =10a(2) =12a(3) =20a(4) =10a(5) =12a(6) =70a(7) =40a(8) =18a(9) =1a(10) =10a(11) =3a(12) =76a(13) =10a(14) =12a(15) =35a(16) =296a(17) =9a(18) =10a(19) =2a(20) =3a(21) =20a(22) =10a(23) =6a(24) =14a(25) =184a(26) =9a(27) =10a(28) =20999a(29) =3

External references