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A057452
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Prime recurrence: a(1)=8, a(n+1) = a(n)-th prime.
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10
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8, 19, 67, 331, 2221, 19577, 219613, 3042161, 50728129, 997525853, 22742734291, 592821132889, 17461204521323, 575411103069067, 21034688742654437, 846729487306354343
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OFFSET
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1,1
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COMMENTS
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a(n) = the Matula number of the rooted tree Q(n) obtained by attaching 3 pendant edges at one of the endpoints of the path-tree P(n) (on n vertices); the root is the other endpoint. - Emeric Deutsch, Jan 18 2014
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LINKS
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MAPLE
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a := proc (n) option remember: if n = 1 then 8 else ithprime(a(n-1)) end if end proc: seq(a(n), n = 1 .. 9); # Emeric Deutsch, Jan 18 2014
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MATHEMATICA
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NestList[ Prime, 8, 12 ]
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CROSSREFS
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KEYWORD
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nonn,hard,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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