A355548 a(n) is the smallest number k such that k occurs in the Reverse-and-Add trajectories of exactly n positive integers less than k.
0, 2, 4, 8, 16, 33, 55, 404, 44, 646, 99, 66, 848, 909, 888, 110, 88, 1090, 132, 176, 1089, 363, 3443, 10010, 121, 1881, 242, 1991, 4323, 3982, 1595, 726, 3553, 2992, 3663, 7447, 484, 1353, 46064, 6446, 5665, 10769, 3993, 2662, 4103, 2882, 968, 1111, 1837, 7667
Offset: 0
Programs
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PARI
a298972(n) = my(i=0); for(k=1, n-1, my(x=k); while(x < n, x=x+eval(concat(Vecrev(Str(x))))); if(x==n, i++)); i a(n) = for(k=0, oo, if(a298972(k)==n, return(k)))
Extensions
More terms from Jinyuan Wang, Jul 07 2022
Comments