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%I #13 Aug 01 2023 11:16:00
%S 1,61,73,133,145,193,253,397,457,481,493,553,565,613,625,661,673,733,
%T 757,793,817,853,913,973,997,1033,1093,1213,1237,1285,1321,1453,1513,
%U 1537,1645,1657,1681,1813,1825,1873,1933,2077,2113,2173,2233,2245,2293,2413,2497,2533,2581,2593,2653,2713
%N Numbers k such that sigma(k) < sigma(k+1) < sigma(k+2) < sigma(k+3).
%H Seiichi Manyama, <a href="/A364662/b364662.txt">Table of n, a(n) for n = 1..10000</a>
%o (PARI) isok(n) = sigma(n)<sigma(n+1) && sigma(n+1)<sigma(n+2) && sigma(n+2)<sigma(n+3);
%Y Cf. A050944, A053224, A364659.
%K nonn,easy
%O 1,2
%A _Seiichi Manyama_, Aug 01 2023
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