1,4

Table of n, a(n) for n=1..10.

G. Bannay, LE COMPTE EST BON

Index entries for similar sequences

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 31-29 = 2.

Cf. A060315.

Sequence in context: A114101 A114007 A282795 * A085946 A280894 A042585

Adjacent sequences: A071816 A071817 A071818 * A071820 A071821 A071822

hard,more,nonn

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

approved