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Search: id:A065546
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| A065546 |
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a(n) is smallest prime > 2*a(n-1), a(1) = 13. |
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+0
1
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| 13, 29, 59, 127, 257, 521, 1049, 2099, 4201, 8419, 16843, 33703, 67409, 134837, 269683, 539389, 1078787, 2157587, 4315183, 8630387, 17260781, 34521589, 69043189, 138086407, 276172823, 552345671, 1104691373, 2209382761
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,200
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MATHEMATICA
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NextPrim[n_Integer] := Block[ {k = n + 1}, While[ !PrimeQ[k], k++ ]; Return[k]]; a[1] = 13; a[n_] := NextPrim[ 2*a[n - 1]]; Table[ a[n], {n, 1, 35} ]
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PROGRAM
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(PARI) { for (n=1, 200, if (n>1, a=nextprime(2*a), a=13); write("b065546.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Oct 21 2009]
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CROSSREFS
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Sequence in context: A094481 A045637 A146743 this_sequence A075636 A139838 A141196
Adjacent sequences: A065543 A065544 A065545 this_sequence A065547 A065548 A065549
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KEYWORD
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nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Nov 28 2001
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