A288660 Numbers whose cubes have an even number of digits.

3, 4, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98

Offset

1,1

Comments

The sequence of cubes starts: 27, 64, 1000, 1331, 1728, 2197, 2744, 3375, 4096, 4913, 5832, ...

Links

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

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

Crossrefs

Cf. A288657, A288658, A288659.

Sequence in context: A226303 A117781 A075100 * A212440 A066861 A292564

Adjacent sequences: A288657 A288658 A288659 * A288661 A288662 A288663

Keyword

nonn,base,easy,changed

Author

Lars Blomberg, Jun 13 2017

Status

approved