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A172156
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Primes in the chain of repeated application of x->2*x+3, starting at x=2.
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5
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7, 17, 37, 157, 317, 1277, 2557, 20477, 655357, 5242877, 671088637, 2684354557, 5368709117, 343597383677, 23058430092136939517, 23611832414348226068477, 48357032784585166988247037, 830767497365572420564879412675215357
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Rest[Select[NestList[2#+3&, 2, 500], PrimeQ]] (* Harvey P. Dale, Nov 17 2012 *)
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PROG
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(Magma) x:=2; a:=[n eq 1 select 2*x+3 else 2*Self(n-1)+3: n in [1..120]]; [a[i]: i in [1..#a] | IsPrime(a[i])]; // Bruno Berselli, May 14 2013
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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