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A134845 Smallest number k not divisible by 10 such that k^2 contains exactly n zeros. 13

%I #12 Aug 17 2020 01:56:59

%S 32,101,448,1001,10004,10001,100004,100001,1000004,1000001,10000004,

%T 10000001,100000004,100000001,1000000004,1000000001

%N Smallest number k not divisible by 10 such that k^2 contains exactly n zeros.

%H J. Browkin, <a href="https://web.archive.org/web/20071220044826/http://www.impan.gov.pl/Kryptologia/GROEB1.pdf">Groebner basis</a>.

%e a(1)=32 because 32 is smallest number whose square contains exactly one zero.

%Y Cf. A134843, A134844, A134846.

%K nonn,base

%O 1,1

%A _Artur Jasinski_, Nov 13 2007, Nov 16 2007

%E a(9)-a(16) from _Arkadiusz Wesolowski_, Jan 19 2013

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)