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A175649 a(n) = sopf(n) + sopf(n+1). 4
2, 5, 5, 7, 10, 12, 9, 5, 10, 18, 16, 18, 22, 17, 10, 19, 22, 24, 26, 17, 23, 36, 28, 10, 20, 18, 12, 38, 39, 41, 33, 16, 33, 31, 17, 42, 58, 37, 23, 48, 53, 55, 56, 21, 33, 72, 52, 12, 14, 27, 35, 68, 58, 21, 25, 31, 53, 90, 69, 71, 94, 43, 12, 20, 34, 83, 86, 45, 40, 85, 76 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n)=A008472(n)+A008472(n+1).

a(n)=A008472(n(n+1)). - Jon Maiga, Jul 26 2019

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

MATHEMATICA

sopf[n_] := If[n < 2, 0, Plus @@ FactorInteger[n][[All, 1]]];

Table[sopf[n] + sopf[n + 1], {n, 71}] (* Jon Maiga, Jul 26 2019 *)

Join[{2}, Total/@Partition[Table[Total[FactorInteger[n][[All, 1]]], {n, 2, 80}], 2, 1]] (* Harvey P. Dale, Jan 08 2022 *)

CROSSREFS

Cf. A008472.

Sequence in context: A256300 A342852 A023850 * A240497 A142353 A161180

Adjacent sequences:  A175646 A175647 A175648 * A175650 A175651 A175652

KEYWORD

nonn

AUTHOR

Zak Seidov, Aug 02 2010

STATUS

approved

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Last modified May 28 04:02 EDT 2022. Contains 354112 sequences. (Running on oeis4.)