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Fractional part of square root of a(n) starts with digit 8.
1

%I #12 Aug 15 2021 09:36:29

%S 8,15,24,34,47,61,62,78,79,97,98,117,118,140,141,164,165,166,191,192,

%T 193,220,221,222,250,251,252,283,284,285,317,318,319,320,354,355,356,

%U 357,393,394,395,396,433,434,435,436,476,477,478,479,520,521,522,523

%N Fractional part of square root of a(n) starts with digit 8.

%o (Python)

%o from math import sqrt

%o def ok(n): r = sqrt(n); return int(10*(r-int(r))) == 8

%o print(list(filter(ok, range(524)))) # _Michael S. Branicky_, Aug 15 2021

%Y Cf. A034114.

%K nonn,easy,base

%O 1,1

%A _Patrick De Geest_, Sep 15 1998