A164009 - OEIS

A164009

Zero together with row 9 of the array in A163280.

0, 19, 38, 51, 76, 75, 114, 105, 136, 162, 190, 209, 264, 273, 308, 345, 384, 425, 468, 513, 560, 609, 660, 713, 768, 825, 884, 945, 1008, 1073, 1140, 1209, 1280, 1353, 1428, 1505, 1584, 1665, 1748, 1833, 1920, 2009, 2100, 2193, 2288, 2385, 2484, 2585, 2688

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..48.

Index entries for linear recurrences with constant coefficients, signature (3, -3, 1).

FORMULA

Conjecture: a(n) = A028566(n), n > 12. [R. J. Mathar, Jul 31 2010]

MAPLE

A033676 := proc(n) local dvs; dvs := sort(convert(numtheory[divisors](n), list)) ; op(floor((nops(dvs)+1)/2) , dvs) ; end proc:

A163280 := proc(n, k) local r, T ; r := 0 ; for T from k^2 by k do if A033676(T) = k then r := r+1 ; if r = n then return T ; end if; end if; end do: end proc:

printf("0, ") ; for n from 1 to 90 do printf("%d, ", A163280(9, n)) ; end do ; # R. J. Mathar, Jul 31 2010

CROSSREFS

Cf. A008578, A161344, A161345, A163280, A164000, A164008, A164010.

Sequence in context: A067205 A196185 A040342 * A235030 A048844 A008601

Adjacent sequences: A164006 A164007 A164008 * A164010 A164011 A164012

KEYWORD

nonn

AUTHOR

Omar E. Pol, Aug 08 2009

EXTENSIONS

Terms beyond a(12) from R. J. Mathar, Jul 31 2010

STATUS

approved