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Search: id:A108420
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| A108420 |
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Numbers n such that n!! + prime(n) is prime. |
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+0
1
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| 3, 14, 20, 54, 56, 144, 206, 212, 436, 1610, 4450, 4512, 5202, 6684
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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There is no further term up to 8800. - Farideh Firoozbakht (f.firoozbakht(AT)math.ui.ac.ir), Aug 19 2005
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MATHEMATICA
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Select[Range[1610], PrimeQ[ #!! - Prime[ # ]] &]
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CROSSREFS
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Cf. A007749, A064401.
Sequence in context: A121226 A063633 A108933 this_sequence A015639 A019000 A071836
Adjacent sequences: A108417 A108418 A108419 this_sequence A108421 A108422 A108423
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KEYWORD
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nonn
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AUTHOR
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Amineh Farzannia (afarzannia(AT)yahoo.com), Jul 06 2005
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EXTENSIONS
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More terms from Farideh Firoozbakht (f.firoozbakht(AT)math.ui.ac.ir), Aug 19 2005
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