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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 (list; graph; refs; listen; history; text; internal format)
 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.)