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

0,2

Comments

a(n) is the smallest k such that A298972(k) = n.

Links

Table of n, a(n) for n=0..49.

Prog

(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)))

Crossrefs

Cf. A298972, A355550.

Sequence in context: A233424 A137181 A272698 * A036373 A119610 A121485

Adjacent sequences: A355545 A355546 A355547 * A355549 A355550 A355551

Keyword

nonn,base

Author

Felix Fröhlich, Jul 06 2022

Extensions

More terms from Jinyuan Wang, Jul 07 2022

Status

approved