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Search: id:A052334
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| 3, 5, 7, 19, 31, 43, 103, 223, 367, 463, 5503, 738197503
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Start with n=1, take 2n+1, if composite take 2n+1 again, keep going until you reach a prime. Repeat for n=2, 3... If prime is a record, add to sequence. If never reach a prime, skip that value of n.
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CROSSREFS
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Cf. A050412, A051914, A052333, A052339, A052340.
Sequence in context: A079131 A106919 A005850 this_sequence A154526 A126144 A072002
Adjacent sequences: A052331 A052332 A052333 this_sequence A052335 A052336 A052337
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KEYWORD
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nonn,nice
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AUTHOR
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Christian G. Bower (bowerc(AT)usa.net), Dec 19 1999
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EXTENSIONS
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Next term is a 771-digit prime reached after 2552 iterations starting from 73 - Warut Roonguthai (warut822(AT)yahoo.com). This was proved to be a prime by Paul Jobling (Paul.Jobling(AT)WhiteCross.com) using PrimeForm and by Ignacio Larrosa Canestro (ignacio.larrosa(AT)eresmas.net) using Titanix (http://www.znz.freesurf.fr/pages/titanix.html). [Oct 30, 2000]
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