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A115929 Numbers k such that k and 4*k, taken together, are zeroless pandigital, that is, use all the digits 1-9 exactly once. 5

%I

%S 3942,4392,5796,7956

%N Numbers k such that k and 4*k, taken together, are zeroless pandigital, that is, use all the digits 1-9 exactly once.

%e 3942 and 3942*4=15768 use once all the digits from 1 to 9.

%t Select[Range[1000, 9999], Union[IntegerDigits[#], IntegerDigits[4 #]] == {1, 2, 3, 4, 5, 6, 7, 8, 9} &] (* _Tanya Khovanova_, Jul 05 2021 *)

%Y Cf. A054383, A064160, A115927, A115930, A115931, A115932.

%K nonn,base,fini,full

%O 1,1

%A _Giovanni Resta_, Feb 06 2006

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Last modified October 17 12:08 EDT 2021. Contains 348048 sequences. (Running on oeis4.)