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A058220 Ultra-useful primes: smallest k such that 2^(2^n) - k is prime. +0
3
1, 3, 5, 15, 5, 59, 159, 189, 569, 105, 1557, 2549, 2439, 13797, 25353 (list; graph; listen)
OFFSET

1,2
CROSSREFS

Cf. A058221.

Sequence in context: A129326 A118562 A115043 this_sequence A111869 A093015 A066420

Adjacent sequences: A058217 A058218 A058219 this_sequence A058221 A058222 A058223

KEYWORD

nonn,hard,nice

AUTHOR

Warren Smith (wds(AT)research.nj.nec.com), Nov 30 2000

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Last modified September 5 19:27 EDT 2008. Contains 143485 sequences.

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