Least happy number with next happy number of distance n.

Terms

a(0) =31a(1) =68a(2) =7a(3) =19a(4) =23a(5) =1a(6) =219a(7) =293a(8) =70a(9) =193a(10) =208a(11) =32a(12) =748a(13) =1233a(14) =1457a(15) =973a(16) =263a(17) =338a(18) =49a(19) =109a(20) =763a(21) =5606a(22) =239a(23) =1487a(24) =8884a(25) =1933a(26) =1636a(27) =139a(28) =1607a(29) =3932