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OFFSET
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1,1
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COMMENTS
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The terms of this sequence are sometimes called "Double Mersenne numbers" (cf. A263686).
Agrees with A077586 in the first four terms, but then the two sequences differ for the first time at n = 5, because prime(5) = 11 is not in A000043.
a(5) is too large to include in data section (see A276641).
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LINKS
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FORMULA
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PROG
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(PARI) forprime(p=1, 11, if(ispseudoprime(2^p-1), print1(2^(2^p-1)-1, ", ")))
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CROSSREFS
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KEYWORD
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nonn,bref
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AUTHOR
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STATUS
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approved
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