A036534 Smallest cube containing exactly n 7's.

0, 27, 17576, 571787, 5177717, 7797729087, 25750777177, 7707245470777, 744736797077707, 17373777757776999, 77777383297757779, 77077787864771842777, 2717772770751727979277, 74677779777959671778577, 787773477172377877676776, 77227778717777797207914717

Offset

0,2

Comments

a(n)^(1/3) = A048372(n) is the index of the first occurrence of n in sequence A269247. - M. F. Hasler, Feb 21 2016

Links

Giovanni Resta, Table of n, a(n) for n = 0..22

Formula

a(n) = A048372(n)^3. - M. F. Hasler, Feb 21 2016

Mathematica

nsmall = Table[Infinity, 20];
For[i = 0, i <= 10^6, i++, n0 = Count[IntegerDigits[i^3], 7];
  If[nsmall[[n0 + 1]] > i^3, nsmall[[n0 + 1]] = i^3]];
Cases[nsmall, _?NumberQ] (* Robert Price, Mar 21 2020 *)

Crossrefs

Cf. A048372, A036527 - A036536 for other digits 0 - 9.

Analog for squares: A036514 = A048352^2.

Sequence in context: A001321 A263601 A111415 * A167731 A357506 A343692

Adjacent sequences: A036531 A036532 A036533 * A036535 A036536 A036537

Keyword

nonn,base

Author

David W. Wilson

Extensions

Extended with a(0) = 0 by M. F. Hasler, Feb 21 2016

a(11)-a(15) from Giovanni Resta, Jun 29 2018

Status

approved