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A202780 Smallest number whose cube begins and ends with the same n digits, and with any other digit(s) in between. 0
7, 108, 335, 6667, 104636, 333335, 4504625, 70585736, 333333335, 1818181815, 33531510511, 333333333335, 198817904169 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
335^3 = 37595375 starts and ends with the same 3 digits.
MATHEMATICA
lst = {}; Do[n = Ceiling[(10^(2*k))^(1/3)]; While[True, d = IntegerDigits[n^3]; If[Take[d, k] == Take[d, -k], Break[]]; n++]; AppendTo[lst, n], {k, 6}]; lst
CROSSREFS
Cf. A161355.
Sequence in context: A231519 A367157 A197447 * A297804 A218819 A033516
KEYWORD
base,more,nonn
AUTHOR
EXTENSIONS
a(9)-a(10) from Donovan Johnson, Jan 12 2012
a(11)-a(13) from Giovanni Resta, Apr 18 2016
STATUS
approved

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Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)