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A128938
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Numbers n such that n(n+1) plus the n-th prime is a prime.
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0
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3, 5, 7, 9, 10, 11, 12, 13, 20, 27, 28, 32, 33, 35, 36, 41, 42, 43, 45, 47, 49, 54, 63, 65, 74, 75, 84, 91, 94, 95, 98, 104, 105, 107, 109, 113, 114, 117, 122, 124, 126, 128, 129, 135, 140, 149, 152, 155, 160, 164, 168, 171, 189, 190, 192, 199, 203, 209, 212, 214, 216
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| Given that 23 is the 9th prime, take 9*10 + 23 = 113, a prime.
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MAPLE
| a:=proc(n) if isprime(n*(n+1)+ithprime(n))=true then n else fi end: seq(a(n), n=1..270); - Emeric Deutsch (deutsch(AT)duke.poly.edu), May 05 2007
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CROSSREFS
| Sequence in context: A047747 A007957 A194377 * A093373 A096849 A080259
Adjacent sequences: A128935 A128936 A128937 * A128939 A128940 A128941
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KEYWORD
| nonn,less
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AUTHOR
| J. M. Bergot (thekingfishb(AT)yahoo.ca), Apr 27 2007
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EXTENSIONS
| Corrected and extended by Emeric Deutsch (deutsch(AT)duke.poly.edu), May 05 2007
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