

A112321


Least ndigit number such that its square is exclusionary, or 0 if no such number exists.


3




OFFSET

1,1


COMMENTS

m has an exclusionary square if m consists of distinct digits and m^2 is made up only of digits not appearing in m.
a(10) = 0 since 10digit numbers either use all digits or at least one digit more than once; a(n) = 0 for n > 10 since numbers with more than 10 digits use at least one digit more than once.


REFERENCES

H. Ibstedt, Solution to Problem 2623 "Exclusionary Powers", Journal of Recreational Mathematics pp. 3469 Vol. 32 no.4 20034 Baywood NY.


LINKS

Table of n, a(n) for n=1..9.


CROSSREFS

Cf. A112322 (corresponding squares), A110815.
Sequence in context: A176934 A126037 A241135 * A276198 A178806 A197864
Adjacent sequences: A112318 A112319 A112320 * A112322 A112323 A112324


KEYWORD

nonn,base,fini


AUTHOR

Lekraj Beedassy and Klaus Brockhaus, Sep 08 2005


STATUS

approved



