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A280644 Numbers k such that k^3 has an odd number of digits and the middle digit is 4. 3
7, 104, 112, 140, 143, 158, 166, 186, 188, 195, 465, 467, 490, 541, 558, 572, 595, 598, 604, 605, 606, 607, 613, 616, 622, 625, 630, 634, 635, 640, 643, 647, 653, 667, 675, 679, 687, 702, 712, 718, 720, 727, 734, 738, 759, 764, 783, 787, 802, 810, 815, 818 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The sequence of cubes starts: 343, 1124864, 1404928, 2744000, 2924207, 3944312, 4574296, 6434856, ...

LINKS

Lars Blomberg, Table of n, a(n) for n = 1..10000

Jeremy Gardiner, Middle digit in cube numbers, Seqfan Mailing list, Dec 12 2016.

EXAMPLE

7^3 = 3(4)3, 195^3 = 741(4)875, 640^3 = 2621(4)4000

CROSSREFS

Cf. A280640-A280643, A280645-A280649, A181354.

See A279420-A279429 for a k^2 version.

See A279430-A279431 for a k^2 version in base 2.

Sequence in context: A318398 A318815 A195246 * A322646 A224706 A001921

Adjacent sequences:  A280641 A280642 A280643 * A280645 A280646 A280647

KEYWORD

nonn,base,easy

AUTHOR

Lars Blomberg, Jan 07 2017

STATUS

approved

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Last modified April 19 21:43 EDT 2021. Contains 343117 sequences. (Running on oeis4.)