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A083518 Beginning with 3, a(i)*a(j) + 2 is prime for all i, j, i<>j. 1
3, 5, 7, 27, 45, 495, 3615, 16695, 533445, 832305, 122789427, 8705408757, 77597861913 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
All terms have the form 10*k+3, 10*k+5, or 10*k+7. [Corrected by Pontus von Brömssen, Oct 12 2023]
Conjecture: sequence is finite.
Next term is > 266*10^9. - David Wasserman, Nov 22 2004
LINKS
EXAMPLE
3*7+2, 5*7+2, 3*5+2, etc. are primes.
CROSSREFS
Cf. A083519.
Sequence in context: A126670 A126669 A126668 * A352106 A061944 A288924
KEYWORD
nonn,more
AUTHOR
Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 05 2003
EXTENSIONS
More terms from David Wasserman, Nov 22 2004
STATUS
approved

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Last modified May 20 02:31 EDT 2024. Contains 372703 sequences. (Running on oeis4.)