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A183077
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Numbers of the form 2^p - 1, with p prime, for which each prime divisor has the form 4j + 3.
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7
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3, 7, 31, 127, 8191, 131071, 524287, 2147483647, 8796093022207, 2305843009213693951, 604462909807314587353087, 618970019642690137449562111, 162259276829213363391578010288127, 170141183460469231731687303715884105727
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OFFSET
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1,1
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COMMENTS
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The Mersenne primes (A000668) are contained in this sequence.
Needed factorizations are in the Cunningham Project.
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LINKS
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Table of n, a(n) for n=1..14.
S. S. Wagstaff, Jr., The Cunningham Project.
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FORMULA
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a(n) = 2^A183073(n) - 1.
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EXAMPLE
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8796093022207 = 2^43 - 1 = 431 * 9719 * 2099863.
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CROSSREFS
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Cf. A000668, A136005, A183075, A183076, A183078.
Cf. A000043, A136003, A183071, A183072, A183073, A183074.
Sequence in context: A081093 A057612 A136005 * A088552 A000668 A136007
Adjacent sequences: A183074 A183075 A183076 * A183078 A183079 A183080
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KEYWORD
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nonn,hard
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AUTHOR
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Stuart Clary, Dec 23 2010
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STATUS
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approved
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