

A071115


a(1) = 1; a(n+1) is the smallest integer >=0 that cannot be obtained from the integers {a(1), ..., a(n)} using each number at most once and the operators +, , *, /.


1




OFFSET

1,2


LINKS

Table of n, a(n) for n=1..10.
G. Bannay, LE COMPTE EST BON
Index entries for similar sequences


EXAMPLE

a(4)=11 because we can write 4+1=5, 4+2=6, 4+2+1=7, 4*2=8, 4*2+1=9, (4+1)*2=10 by using 1, 2 and 4 but we cannot do the same thing for 11.


CROSSREFS

Cf. A060315.
Sequence in context: A089407 A289588 A238425 * A217043 A249696 A156809
Adjacent sequences: A071112 A071113 A071114 * A071116 A071117 A071118


KEYWORD

hard,more,nonn


AUTHOR

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


STATUS

approved



