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Numbers k such that k + 2, k^2 + 2^2, k^4 + 2^4, k^8 + 2^8, k^16 + 2^16 and k^32 + 2^32 are primes.
1

%I #28 Jul 02 2021 02:00:04

%S 2321204055,5231769977,9913873697,20866771125,31610423987,32781538517,

%T 36537262157,40472098305,55135116465,58852670687,59789331177,

%U 74514337967,78206135657,92237967447,96154659567,96567686195,106053318825,121476304065,174983141235,196311688647,200394128147,220092205085,222433800045,236131373415,248686299537

%N Numbers k such that k + 2, k^2 + 2^2, k^4 + 2^4, k^8 + 2^8, k^16 + 2^16 and k^32 + 2^32 are primes.

%H Chai Wah Wu, <a href="/A333664/b333664.txt">Table of n, a(n) for n = 1..53</a>

%Y Subsequence of A285390.

%K nonn

%O 1,1

%A _Chai Wah Wu_, Sep 03 2020

%E a(12)-a(19) from _Chai Wah Wu_, Sep 04 2020

%E a(20)-a(25) from _Bert Dobbelaere_, Sep 06 2020