This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A081030 #13 Aug 28 2025 04:27:59
%S A081030 9,17,27,36,46,64,68,74,88,117,123,138,146,154,199,204,216,232,232,
%T A081030 242,259,256,284,323,337,344,341,357,358,396,443,393,423,465,477,484,
%U A081030 519,521,533,518,569,597,591,626,638,682,666,667,695,712,698,739,746,784
%N A081030 a(n) = largest k such that (sum of digits of k^n) >= k.
%e A081030 a(2) = 17. We have 17^2 = 289 and 2+8+9 >= 17. No number > 17 has this property.
%t A081030 (* the constant 20 may need to be higher for larger n *) Table[Select[Range[20*n], Total[IntegerDigits[#^n]] >= # &][[-1]], {n, 100}] (* _T. D. Noe_, Oct 21 2011 *)
%Y A081030 Cf. A055568, A055569, A055570, A055571, A055572.
%K A081030 base,nonn,changed
%O A081030 1,1
%A A081030 _David W. Wilson_, Mar 02 2003
%E A081030 Definition corrected by _Harvey P. Dale_, Oct 21 2011