OFFSET
1,4
LINKS
Giovanni Resta, Table of n, a(n) for n = 1..61
Cristian Cobeli, DOI^2, arXiv:1911.09003 [math.HO], 2019. See Table 2 p. 8.
Cristian Cobeli, DOI^2, Romanian Journal Of Pure And Applied Mathematics, Tome LXVI, No. 3-4, 2021.
MATHEMATICA
Flatten@ Reap[Sow[1]; Do[v = d (10^nd - 1)/9; s = Solve[v-1 <= x Log10[x] < v, x, Integers]; If[s != {}, Sow[v /. s]], {nd, 15}, {d, 9}]][[2, 1]] (* Giovanni Resta, Dec 05 2019 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Michel Marcus, Dec 05 2019
EXTENSIONS
a(28)-a(41) from Giovanni Resta, Dec 05 2019
STATUS
approved