A110575 Numbers k that divide A110574(k); or k such that A110574(k) is a Niven number.

1, 3, 7, 9, 13, 23, 171, 399, 819, 8673, 17263

Offset

1,2

Comments

a(12) > 138000, if it exists. - Amiram Eldar, Mar 01 2024

Links

Table of n, a(n) for n=1..11.

Example

a(3) = 7 because 1101001100101/7 = 157285871443.

Mathematica

seq[max_] := Module[{o = Select[Range[2*max], OddQ[DigitCount[#, 2][[1]]] &], sum = 0, s = {}}, Do[sum += 10^(o[[k]] - 1); If[Divisible[IntegerReverse[sum], k], AppendTo[s, k]], {k, 1, Length[o]}]; s]; seq[1000] (* Amiram Eldar, Mar 01 2024 *)

Crossrefs

Cf. A005349, A110574.

Sequence in context: A176553 A109370 A018663 * A325556 A174840 A032664

Adjacent sequences: A110572 A110573 A110574 * A110576 A110577 A110578

Keyword

nonn,base,more

Author

Jason Earls, Jul 28 2005

Extensions

a(10)-a(11) from Amiram Eldar, Mar 01 2024

Status

approved