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Search: id:A155047
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A155047 a(1) = 1, a(2) = 2, then a(n) = largest prime factor of the partial sum up to a(n-1). +0
1
1, 2, 3, 3, 3, 3, 5, 5, 5, 5, 7, 7, 7, 7, 7, 7, 11, 11, 11, 11, 11, 11, 13, 13, 13, 13, 13, 13, 17, 17, 17, 17, 17, 17, 19, 19, 19, 19, 19, 19, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 29, 29, 29, 29, 29, 29, 29, 29, 31, 31, 31, 31, 31, 31, 31, 31, 37, 37, 37, 37, 37, 37, 37, 37, 37, 37, 41 (list; graph; listen)
OFFSET

1,2

MAPLE

A006530 := proc(n) max(op(numtheory[factorset](n))) ; end:

A155047 := proc(n) option remember; if n <=2 then n; else A006530( add(procname(i), i=1..n-1)) ; fi; end:

seq(A155047(n), n=1..120) ; # R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 23 2009

CROSSREFS

Sequence in context: A029089 A143345 A046886 this_sequence A029088 A129263 A035367

Adjacent sequences: A155044 A155045 A155046 this_sequence A155048 A155049 A155050

KEYWORD

easy,nonn

AUTHOR

Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Jan 19 2009

EXTENSIONS

Extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 23 2009

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.


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