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Search: id:A153503
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| A153503 |
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Primes p such that 2^(p-1)+3 is prime. |
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1
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| 2, 3, 5, 7, 13, 17, 19, 29, 31, 229, 2371, 4003, 33029, 55457, 58313
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OFFSET
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1,1
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COMMENT
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For p = 2, 2^(p-1)+3 = 5 is prime; for p = 17, 2^(p-1)+3 = 65539 is prime; for p = 31, 2^(p-1)+3 = 1073741827 is prime.
A prime p is in the sequence if and only if p-1 is in A057732.
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CROSSREFS
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Cf. A057732 (numbers n such that 2^n + 3 is prime), A057736 (primes p such that 2^p + 3 is prime), A000043 (primes p such that 2^p - 1 is prime).
Sequence in context: A134207 A133244 A077040 this_sequence A049587 A038903 A136003
Adjacent sequences: A153500 A153501 A153502 this_sequence A153504 A153505 A153506
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KEYWORD
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nonn
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AUTHOR
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Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Dec 28 2008
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EXTENSIONS
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Edited and a(13) - a(15) (based on A057732) added by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Jan 06 2009
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