Second member U0(n) of the smallest positive pair (T0(n), U0(n)) for the n-th 2-happy number couple (D(n), E(n)).

A263009

Second member U0(n) of the smallest positive pair (T0(n), U0(n)) for the n-th 2-happy number couple (D(n), E(n)).

Terms

    a(0) =1a(1) =3a(2) =1a(3) =1a(4) =1a(5) =3a(6) =5a(7) =1a(8) =1a(9) =39a(10) =3a(11) =1a(12) =1a(13) =9a(14) =7a(15) =1a(16) =1a(17) =3a(18) =1a(19) =27a(20) =59a(21) =3a(22) =9a(23) =1a(24) =1a(25) =1a(26) =3a(27) =15a(28) =5a(29) =1

External references