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Search: id:A072225
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| A072225 |
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Numbers n such that Prime(n)+Prime(n+1)+Prime(n+2) is prime. |
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+0
3
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| 3, 4, 5, 7, 8, 9, 10, 11, 13, 16, 18, 19, 20, 22, 23, 26, 29, 34, 35, 37, 38, 45, 47, 50, 58, 60, 61, 62, 64, 68, 69, 70, 75, 77, 79, 80, 83, 87, 88, 90, 91, 94, 95, 97, 101, 113, 116, 119, 120, 121, 126, 128, 132, 133, 134
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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9 is in the sequence because prime(9)+prime(10)+prime(11)=23+29+31=83 is a prime.
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MAPLE
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a:=proc(n) if isprime(ithprime(n)+ithprime(n+1)+ithprime(n+2))=true then n else fi end: seq(a(n), n=1..150); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Apr 24 2006
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MATHEMATICA
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Select[Range[10^4], PrimeQ[Prime[ # ] + Prime[ # + 1] + Prime[ # + 2]] &]
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CROSSREFS
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Cf. A034962, A073681, A117673.
Sequence in context: A078358 A152012 A039131 this_sequence A137689 A081690 A081688
Adjacent sequences: A072222 A072223 A072224 this_sequence A072226 A072227 A072228
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KEYWORD
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easy,nonn
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AUTHOR
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Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Jul 04 2002
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