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%I #8 Apr 11 2021 11:08:12
%S 3,5,17,257,35567,2244677999,111344445566777789,
%T 111222233333334444445666666777788899,
%U 111111222223333333344444455555555566666666777777778888888999999999999
%N Fermat numbers 2^(2^n) + 1 with digits sorted in increasing order and zeros suppressed.
%C The 0, 1, 2, 3, 5 and 7 terms of this sequence are primes. Are there any more?
%t Table[FromDigits[Sort[IntegerDigits[2^2^n+1]]/.(0->Nothing)],{n,0,10}] (* _Harvey P. Dale_, Apr 11 2021 *)
%Y Cf. A000215.
%K base,nonn,nice
%O 0,1
%A _Jason Earls_, Dec 20 2002
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