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 A071107 a(n) is the greatest integer that can be obtained from the integers {1, 2, 3, ..., n} using each number at most once and the operators +,-,*,/,^. 4

%I

%S 1,3,27,

%T 115792089237316195423570985008687907853269984665640564039457584007913129639936

%N a(n) is the greatest integer that can be obtained from the integers {1, 2, 3, ..., n} using each number at most once and the operators +,-,*,/,^.

%C a(4) = 2^(4^4) = 2^256 = 115792089237316195423570985008687907853269984665640564039457584007913129639936 with 78 digits. a(5) = 2^(3^(4^6)) with more than 10^1950 digits.

%e a(3) = 27 because 3^(2+1) = 27 is the greatest integer that can be obtained by using 1, 2, 3 once and the operations +, -, *, /, ^.

%Y Cf. A070960.

%K nonn

%O 1,2

%A Koksal Karakus (karakusk(AT)hotmail.com), May 27 2002

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Last modified September 20 05:51 EDT 2019. Contains 327212 sequences. (Running on oeis4.)