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Concatenated Pandigital (Posted on 2023-09-23)

Find all positive integers N such that the concatenation of N and 7N contains each of the 10 digits exactly once.

No Solution Yet Submitted by Larry

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computer solution

| Comment 1 of 2

for n=1000:99999

ns=char(string(n));

n7s=char(string(7*n));

cat=[ns n7s];

if length(cat)==10

if length(unique(cat))==10

disp([n 7*n])

end

finds n = 14076; 7*n = 98532.

Posted by Charlie on 2023-09-23 08:58:01

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