OFFSET
2,1
COMMENTS
The first listed row is row 2. Row n contains d(n)-1 terms, where d(n) is the number of positive divisors of n.
LINKS
Harvey P. Dale, Table of n, a(n) for n = 2..1000
EXAMPLE
The positive divisors of 20 are 1,2,4,5,10,20. 1+2=3. 2+4=6. 4+5=9. 5+10=15. 10+20=30. So row 20 is (3,6,9,15,30).
MAPLE
with(numtheory): a:=proc(n) local dn: dn:=divisors(n): seq(dn[i]+dn[i+1], i= 1..nops(dn)-1) end proc: for n from 2 to 30 do a(n) end do; # Emeric Deutsch, Jan 05 2008
MATHEMATICA
Table[Total/@Partition[Divisors[n], 2, 1], {n, 30}]//Flatten (* Harvey P. Dale, Mar 08 2022 *)
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Leroy Quet, Dec 20 2007
EXTENSIONS
More terms from Emeric Deutsch, Jan 05 2008
STATUS
approved