

A029785


Numbers k whose cube k^3 has no digit in common with k.


9



2, 3, 7, 8, 22, 27, 43, 47, 48, 52, 53, 63, 68, 77, 92, 157, 172, 177, 187, 188, 192, 222, 223, 252, 263, 303, 378, 408, 423, 442, 458, 468, 477, 478, 487, 527, 552, 558, 577, 587, 588, 608, 648, 692, 707, 772, 808, 818, 823, 843, 888, 918, 922
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OFFSET

1,1


COMMENTS

Original name: Digits of n are not present in n^3.
Might be called "Exclusionary Cubes", although this might be reserved for terms having no duplicate digits, cf. link to rec.puzzles discussion group. Then the largest term would be 639172.  M. F. Hasler, Oct 17 2018


LINKS

Giovanni Resta, Table of n, a(n) for n = 1..1699 (terms < 10^19, first 528 terms from Charles R Greathouse IV)
Cliff Pickover et al, Exclusionary Squares and Cubes, rec.puzzles topic on google groups, January 2002


EXAMPLE

k = 80800000008880080808880080088 is in the sequence because the 87digit number k^3 has only digits 1, ..., 7 and 9.  M. F. Hasler, Oct 16 2018


MATHEMATICA

Select[Range[5000], Intersection[IntegerDigits[#], IntegerDigits[#^3]]=={}&] (* Vincenzo Librandi, Oct 04 2013 *)


PROG

(PARI) is(n)=my(d=Set(digits(n))); setminus(d, Set(digits(n^3)))==d \\ Charles R Greathouse IV, Oct 02 2013
(PARI) is_A029785(n)=setintersect(Set(digits(n)), Set(digits(n^3)))==[] \\ M. F. Hasler, Oct 16 2018


CROSSREFS

Cf. A029786, A029783, A029784, A111116, A113316.
Sequence in context: A114281 A137823 A024540 * A045545 A029790 A206725
Adjacent sequences: A029782 A029783 A029784 * A029786 A029787 A029788


KEYWORD

nonn,base


AUTHOR

Patrick De Geest


EXTENSIONS

Name reworded by Jon E. Schoenfield and M. F. Hasler, Oct 16 2018


STATUS

approved



