A034133 a(n) = ceiling((n + 7/10)^3).

5, 20, 51, 104, 186, 301, 457, 659, 913, 1226, 1602, 2049, 2572, 3177, 3870, 4658, 5546, 6540, 7646, 8870, 10219, 11698, 13313, 15070, 16975, 19035, 21254, 23640, 26199, 28935, 31856, 34966, 38273, 41782, 45500, 49431, 53583, 57961, 62571, 67420, 72512, 77855

Offset

1,1

Comments

Original name: Decimal part of cube root of a(n) starts with 7: first term of runs.

Links

Zhuorui He, Table of n, a(n) for n = 1..10000

Formula

a(n) = ceiling((n + 7/10)^3). - Zhuorui He, Dec 05 2025

Mathematica

Join[{5}, (If[#[[2]]-#[[1]]==1, Nothing, #]&/@Partition[Select[Range[ 63000], NumberDigit[ Surd[#, 3], -1]==7&], 2, 1])[[All, 2]]] (* Requires Mathematica version 12 or later *) (* Harvey P. Dale, Jul 17 2021 *)

Crossrefs

Cf. A034123.

Sequence in context: A134481 A358632 A062158 * A006504 A007045 A102227

Adjacent sequences: A034130 A034131 A034132 * A034134 A034135 A034136

Keyword

nonn,base,easy

Author

Patrick De Geest, Sep 15 1998

Extensions

Name revised and more terms from Zhuorui He, Dec 05 2025

Status

approved