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 A030676 Smallest nontrivial extension of n-th palindrome which is a square. 2
 16, 25, 36, 49, 529, 64, 729, 81, 900, 1156, 225, 3364, 441, 55225, 66049, 7744, 8836, 99225, 101124, 111556, 12100, 131044, 14161, 15129, 16129, 17161, 181476, 191844, 2025, 212521, 22201, 232324, 242064, 25281, 26244, 27225 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 MAPLE revdigs:= proc(n) local L, nL, i; L:= convert(n, base, 10); add(L[-i]*10^(i-1), i=1..nops(L)); end: g:= proc(d) local m, x, y;   if d::even then     m:= d/2;     seq(x*10^m+revdigs(x), x=10^(m-1)..10^m-1)   else     m:= (d-1)/2;     seq(seq(x*10^(m+1)+y*10^m+revdigs(x), y=0..9), x=10^(m-1)..10^m-1)   fi end proc: g(1):= \$1..9: f:= proc(x) local d, y;   for d from 1 do     y:= ceil(sqrt(x*10^d))^2;     if y < (x+1)*10^d then return y fi   od; end proc: map(f, [g(1), g(2), g(3)]); # Robert Israel, Aug 12 2018 CROSSREFS Cf. A030677. Sequence in context: A291334 A175689 A030666 * A264604 A218439 A192689 Adjacent sequences:  A030673 A030674 A030675 * A030677 A030678 A030679 KEYWORD nonn,base,look AUTHOR STATUS approved

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Last modified May 9 18:53 EDT 2021. Contains 343744 sequences. (Running on oeis4.)