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A175120
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a(1)=2. a(n) = the smallest prime p > a(n-1) such that p-a(n-1)-1 is composite.
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3
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2, 7, 17, 43, 53, 79, 89, 139, 149, 199, 227, 263, 313, 347, 373, 383, 409, 419, 541, 557, 593, 619, 641, 677, 727, 743, 769, 797, 823, 839, 983, 1009, 1019, 1069, 1091, 1117, 1151, 1187, 1213, 1223, 1249, 1259, 1381, 1409, 1459, 1481, 1531, 1553, 1579, 1601
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OFFSET
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1,1
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COMMENTS
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LINKS
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MATHEMATICA
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sp[n_]:=Module[{np=NextPrime[n], pa1}, pa1=np-n-1; While[PrimeQ[pa1] || pa1==1, np=NextPrime[np]; pa1=np-n-1]; np]; Join[{2}, NestList[sp, 7, 50]] (* Harvey P. Dale, Jan 10 2012 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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