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Search: id:A083518
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| A083518 |
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Beginning with 3, a(i)*a(j) + 2 is prime for all i,j, i<>j. |
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+0
2
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| 3, 5, 7, 27, 45, 495, 3615, 16695, 533445, 832305, 122789427, 8705408757, 77597861913
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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From 2nd term onwards, terms have the form 10k+5 or 10k+7. Conjecture: sequence is finite.
Next term is > 266*10^9. - David Wasserman (wasserma(AT)spawar.navy.mil), Nov 22 2004
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EXAMPLE
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3*7 +2, 5*7+2, 3*5+2, etc. are primes.
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CROSSREFS
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Adjacent sequences: A083515 A083516 A083517 this_sequence A083519 A083520 A083521
Sequence in context: A126668 A126669 A067786 this_sequence A061944 A093574 A076846
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy and Meenakshi Srikanth (amarnath_murthy(AT)yahoo.com), May 05 2003
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EXTENSIONS
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More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Nov 22 2004
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