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 +,-,*,/,^.

1, 3, 27, 115792089237316195423570985008687907853269984665640564039457584007913129639936

Offset: 1

Author

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

Keywords

• nonn

Comments

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

Examples

			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 +, -, *, /, ^.
		

Crossrefs

Cf. A070960.