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A110788
Copies of 7 and 1 alternately such that every partial concatenation is a prime.
10
7, 1, 77, 1111, 77777, 1111111111, 77777777777777777777777, 111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
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OFFSET
1,1
LINKS
Table of n, a(n) for n=1..8.
EXAMPLE
7, 71, 7177, 71771111, ... are all prime.
CROSSREFS
Cf.
A110774
,
A110775
,
A110776
,
A110777
,
A110778
,
A110780
,
A110781
,
A110782
,
A110783
,
A110789
.
Sequence in context:
A281620
A321187
A221367
*
A100254
A119935
A027447
Adjacent sequences:
A110785
A110786
A110787
*
A110789
A110790
A110791
KEYWORD
base
,
nonn
AUTHOR
Amarnath Murthy
, Aug 13 2005
EXTENSIONS
More terms from
Joshua Zucker
, Jan 11 2006
STATUS
approved
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Last modified March 18 22:47 EDT 2024. Contains 370951 sequences. (Running on oeis4.)