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Search: id:A135525
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| 0, 2, 5, 7, 12, 19, 23, 29, 40, 53, 61, 78, 97, 120, 140, 158, 187, 218, 234, 271, 312, 355, 402, 444, 497, 556, 617, 649, 716, 787, 860, 939, 993, 1076, 1165, 1262, 1363, 1466, 1573, 1682, 1795, 1905, 2005, 2132, 2196, 2327, 2464, 2603, 2752, 2903, 3060, 3223
(list; graph; listen)
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OFFSET
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1,2
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MAPLE
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A000961 := proc(n) option remember ; local a; if n = 1 then 1; else for a from procname(n-1)+1 do if nops( ifactors(a)[2] ) = 1 then RETURN(a); fi; od: fi; end: A025473 := proc(n) option remember ; if n <= 2 then n; else ifactors( A000961(n))[2] ; op(1, op(1, %)) ; fi; end: A137152 := proc(n) option remember ; local a, m, i; if n = 1 then RETURN([1]) ; else a := procname(n-1) ; m := A025473(n) ; for i from 1 to nops(a) do if gcd(op(i, a), m) <> 1 then m := m*op(i, a) ; a := subsop(i=1, a) ; fi; od; a := [op(a), m] ; fi; RETURN(a) ; end: A135525 := proc(n) local a, k, i ; a := 0 ; k :=A137152(n) ; for i in k do if i <> 1 then a := a+i; fi; od; a ; end: for n from 1 to 80 do printf("%d, ", A135525(n)) ; od: [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Dec 17 2008]
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CROSSREFS
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Cf. A137152.
Sequence in context: A023668 A023564 A005895 this_sequence A117538 A001060 A042343
Adjacent sequences: A135522 A135523 A135524 this_sequence A135526 A135527 A135528
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KEYWORD
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nonn
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AUTHOR
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Mats Granvik (mgranvik(AT)abo.fi), Feb 19 2008
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Dec 17 2008
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