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Search: id:A091180
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| 7, 13, 19, 31, 37, 67, 109, 127, 139, 157, 181, 199, 211, 307, 337, 379, 409, 487, 499, 541, 571, 577, 631, 751, 769, 787, 811, 829, 877, 919, 937, 991, 1009, 1039, 1117, 1201, 1291, 1297, 1327, 1381, 1399, 1459, 1471, 1567, 1621, 1669, 1759, 1777, 1801
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Mother primes of order 1. - Artur Jasinski (grafix(AT)csl.pl), Dec 12 2007
Primes p such that (p+2)/3 is prime [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Sep 23 2009]
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FORMULA
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a(n) = 3*A088878(n)-2.
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MATHEMATICA
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n = 1; a = {}; Do[If[PrimeQ[(Prime[k] + 2n)/(2n + 1)], AppendTo[a, Prime[k]]], {k, 1, 500}]; a - Artur Jasinski (grafix(AT)csl.pl), Dec 12 2007
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CROSSREFS
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Cf. A088878, A091179, A091181.
Cf. A136020.
Sequence in context: A106870 A040038 A081765 this_sequence A053458 A040058 A023255
Adjacent sequences: A091177 A091178 A091179 this_sequence A091181 A091182 A091183
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KEYWORD
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easy,nonn
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AUTHOR
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Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 27 2003
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