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A071110 a(n) is the smallest integer >=0 we cannot obtain from n, n+1, n+2, n+3, n+4 and the operators +, -, *, /, using each number only once. 5
29, 76, 141, 172, 193, 197, 205, 211, 245, 181, 162, 85, 86, 69, 71, 61, 62, 67, 52, 53, 58, 58, 58, 59, 62, 45, 46, 49, 20, 51, 7, 22, 7, 7, 10, 7, 7, 7, 7, 15, 7, 13, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 10, 7, 7, 7, 7, 7, 7, 10, 7, 7 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

It seems that a(n)=7 for all n>=62, but this needs to be proved.

LINKS

Table of n, a(n) for n=0..63.

G. Bannay, LE COMPTE EST BON

EXAMPLE

a(61)=10 because by using 61, 62, 63, 64, 65 we can get 62-61=1, 63-61=2, ..., 63/((64-61)*(65-62))=7, (65-61)*(64+62)/63=8, (65-62)*(64-61)=9 but we cannot obtain 10 in the same way.

CROSSREFS

Cf. A060316.

Sequence in context: A161617 A142305 A184072 * A263534 A273360 A176185

Adjacent sequences:  A071107 A071108 A071109 * A071111 A071112 A071113

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified April 22 10:13 EDT 2019. Contains 322330 sequences. (Running on oeis4.)