a(n) is the least term of the period of the sequence defined by t(1)=n; t(k) = t(k-1)/sod(t(k-1)) if t(k-1) is a multiple of sod(t(k-1)) or t(k-1)*sod(t(k-1)) otherwise, where sod(m)=A007953(m) is the sum of digits of m.
A110731
a(n) is the least term of the period of the sequence defined by t(1)=n; t(k) = t(k-1)/sod(t(k-1)) if t(k-1) is a multiple of sod(t(k-1)) or t(k-1)*sod(t(k-1)) otherwise, where sod(m)=A007953(m) is the sum of digits of m.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =10a(10) =1144a(11) =1a(12) =28a(13) =10a(14) =10a(15) =28a(16) =136a(17) =1a(18) =19a(19) =10a(20) =1a(21) =1144a(22) =7522840a(23) =1a(24) =28a(25) =208a(26) =1a(27) =28a(28) =3016a(29) =10
External references
- oeis: A110731