A048370 a(n)^3 is smallest cube containing exactly n 5's.

5, 25, 136, 715, 1526, 11828, 8121, 115798, 319405, 1771087, 2179693, 11665419, 38160335, 176024528, 1367063798, 3257101805, 9109186828, 38598478444, 136736651535, 380814792667, 821922685008

Offset: 1

Author

Patrick De Geest, Mar 15 1999

Keywords

• nonn
• base
• more

Links

• Eric Weisstein's World of Mathematics, Cubic Number

Crossrefs

Cf. A036532, A048365, A048366, A048367, A048368, A048369, A048371, A048372, A048373, A048374.

Programs

Mathematica

nsmall = Table[Infinity, 15];
For[i = 0, i <= 10^6, i++, n0 = Count[IntegerDigits[i^3], 5];
  If[nsmall[[n0]] > i, nsmall[[n0]] = i]];
Cases[nsmall, ?NumberQ] (* _Robert Price, Mar 20 2020 *)

Extensions

a(14) from Michel ten Voorde Jun 13 2003

a(15)-a(20) from Lars Blomberg, Jun 12 2011

a(21) from Giovanni Resta, Jun 29 2018