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A206001
Least k such that k*2^m + 1 has a covering set with precisely n primes.
1
271129, 78557, 1777613, 169073869
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OFFSET
6,1
COMMENTS
a(10) > 2^31. a(11) = 1143502909. 
Arkadiusz Wesolowski
, Apr 29 2012
LINKS
Table of n, a(n) for n=6..9.
Wikipedia,
Covering set
Wikipedia,
Sierpinski number
EXAMPLE
271129 has the covering set {3, 5, 7, 13, 17, 241}.
78557 has the covering set {3, 5, 7, 13, 19, 37, 73}.
1777613 has the covering set {3, 5, 7, 13, 17, 19, 109, 433}.
169073869 has the covering set {3, 5, 7, 11, 13, 41, 61, 151, 331}.
CROSSREFS
Cf.
A076336
.
Sequence in context:
A249254
A075467
A257647
*
A244561
A137715
A258893
Adjacent sequences:
A205998
A205999
A206000
*
A206002
A206003
A206004
KEYWORD
more
,
nonn
AUTHOR
Arkadiusz Wesolowski
, Feb 10 2012
STATUS
approved
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Last modified April 14 00:20 EDT 2024. Contains 371652 sequences. (Running on oeis4.)