

A071819


a(n) is the difference between the two smallest positive integers that you cannot obtain using the integers {1,2,...,n} at most once and the four operators +, , *, /.


0




OFFSET

1,4


LINKS



EXAMPLE

a(4)=2 because 29 and 31 are the smallest numbers that you cannot obtain using {1,2,3,4} and the four operations and 3129 = 2.


CROSSREFS



KEYWORD

hard,more,nonn


AUTHOR

Koksal Karakus (karakusk(AT)hotmail.com), Jun 07 2002


STATUS

approved



