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A030686 Smallest nontrivial extension of n^2 which is a square. 4

%I #12 Apr 01 2020 14:26:50

%S 16,49,900,169,256,361,4900,6400,8100,10000,12100,1444,16900,19600,

%T 22500,25600,28900,3249,36100,40000,44100,48400,52900,57600,62500,

%U 67600,72900,78400,84100,90000,96100,102400,108900,115600,122500

%N Smallest nontrivial extension of n^2 which is a square.

%C Nontrivial extension means appending at least one digit even if the number is already a square.

%H M. F. Hasler, <a href="/wiki/M. F. Hasler/Truncated_squares">Truncated squares</a>, OEIS wiki, Jan 16 2012

%H <a href="/index/Sq#sqtrunc">Index to sequences related to truncating digits of squares</a>.

%F a(n) = A030687(n)^2. - _M. F. Hasler_, Sep 28 2014

%F a(n) = A030666(n^2). - _Alonso del Arte_, Apr 01 2020

%Y Cf. A030687, A023110, A031149, A031150, A202303.

%Y See also A023110 = A031149^2 and A202303 = A031150^2 for a related concept, and cross-references there (and in links) for the analog in bases other than 10. - _M. F. Hasler_, Sep 28 2014

%K nonn,base

%O 1,1

%A _Patrick De Geest_

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Last modified August 14 10:15 EDT 2024. Contains 375159 sequences. (Running on oeis4.)