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%I #3 Mar 30 2012 17:30:43
%S 1,2,4,19380,285090,337536,448630,532390,534430,545140,547536,585106,
%T 602056,677076,876180,1007386,1030200,1331950,1462000,1736346,1878790,
%U 1883856,2071960,2194666,2240890,2763010,2824720,3018606,3114996
%N Numbers n such that n+1, n^2+1, n^4+1 and n^8+1 are primes.
%t Do[ If[ PrimeQ[n + 1] && PrimeQ[n^2 + 1] && PrimeQ[n^4 + 1] && PrimeQ[n^8 + 1], Print[n]], {n, 1, 10^7}]
%Y Cf. A070325.
%K nonn
%O 1,2
%A _Robert G. Wilson v_, May 13 2002