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%I #9 Sep 21 2015 20:38:24
%S 598,1886,11590,21098,24734,32578,91078,95170,107606,134930,143318,
%T 179998,253598,258482,259010,287274,361730,374402,568514,706142,
%U 751394,831290,920782,1074026,1105646,1327562,1514602,1548318,1579394,1742830,1794854,1808678,1952222
%N Even Quasi-Carmichael numbers.
%H Tim Johannes Ohrtmann, <a href="/A262252/b262252.txt">Table of n, a(n) for n = 1..84</a>
%e 598 is even, composite and squarefree and at least one nonzero integer b exists such that for every prime factor p of n, p+b divides n+b (2): 598 = 2*13*23 and 4, 15, 25 all divide 600.
%o (PARI) n=0; until(n==1000000, n+=2; if(!isprime(n), if(issquarefree(n), f=factor(n); k=0; b=0; until(b==n, b+=2; c=0; for(i=1, #f[, 1], if((n+b)%(f[i, 1]+b)>0, c++)); if(c==0, k++)); if(k>0, print1(n, ", ")))))
%Y Cf. A029562, A029564, A029566, A029568, A029570, A257750.
%K nonn
%O 1,1
%A _Tim Johannes Ohrtmann_, Sep 16 2015
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