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a(1) = 16; for n > 1, a(n) is the smallest integer > 0 such that the concatenation a(n)a(n-1)...a(2)a(1) is a square.
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%I #7 Sep 17 2023 21:32:53

%S 16,21,602,9919,201825782,786148373230451374,

%T 222497947677972243238266280556039145,

%U 689281060145549220555862860288211510118547777224654163905516661857896088

%N a(1) = 16; for n > 1, a(n) is the smallest integer > 0 such that the concatenation a(n)a(n-1)...a(2)a(1) is a square.

%Y Cf. A061359, A065691, A065776, A065777.

%K base,nonn

%O 1,1

%A _Klaus Brockhaus_, Nov 19 2001

%E More terms from Ulrich Schimke (ulrschimke(AT)aol.com), Dec 18 2001