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Numbers n with property that for each single digit d of n, we can also see the decimal expansions of d^2 and d^3 as substrings of n. Also n may not contain any 0 digits.
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%I #11 Sep 29 2024 11:57:49

%S 1,11,111,1111,11111,111111,1111111,11111111,111111111,1111111111,

%T 11111111111,111111111111,1111111111111,11111111111111,

%U 111111111111111,1111111111111111,11111111111111111,111111111111111111,216343649812512729

%N Numbers n with property that for each single digit d of n, we can also see the decimal expansions of d^2 and d^3 as substrings of n. Also n may not contain any 0 digits.

%H David Applegate, <a href="/A135463/b135463.txt">Table of n, a(n) for n = 1..300</a>

%H David Applegate, <a href="/A135463/a135463.cc.txt">C++ program for sequences of this type</a>

%o (C++) // For C++ program see the Applegate link.

%Y Cf. A134962.

%K nonn,base

%O 1,2

%A Proposed by _Zak Seidov_, Feb 04 2007; computed by _David Applegate_ and _N. J. A. Sloane_, Feb 07 2008