cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A036534 Smallest cube containing exactly n 7's.

Original entry on oeis.org

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

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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

Crossrefs

Cf. A048372, A036527 - A036536 for other digits 0 - 9.
Analog for squares: A036514 = A048352^2.

Programs

  • 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 *)

Formula

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

Extensions

Extended with a(0) = 0 by M. F. Hasler, Feb 21 2016
a(11)-a(15) from Giovanni Resta, Jun 29 2018