login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A343137 Positions of records in A188172. 0
1, 7, 63, 315, 945, 1575, 3465, 10395, 17325, 26775, 45045, 135135, 225225, 405405, 675675, 1576575, 2027025, 2297295, 3828825, 6891885, 11486475, 26801775, 34459425, 43648605, 72747675, 130945815, 218243025, 509233725, 654729075, 1003917915, 1527701175, 3011753745, 4583103525 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..33.

EXAMPLE

945 is in the sequence as A188172(945) = 4 via the divisors 7, 15, 63 and 135 and no positive integer < 945 has at least four such (7 (mod 8)) divisors.

MATHEMATICA

Function[{s, r}, Map[FirstPosition[s, #][[1]] &, r]] @@ {#, Union@ FoldList[Max, #]} &@ Array[DivisorSum[#, 1 &, Mod[#, 8] == 7 &] &, 10^6] (* Michael De Vlieger, Apr 08 2021 *)

CROSSREFS

Cf. A188172, A188226.

Sequence in context: A304895 A161201 A007291 * A188226 A055405 A100741

Adjacent sequences:  A343134 A343135 A343136 * A343138 A343139 A343141

KEYWORD

nonn

AUTHOR

David A. Corneth, Apr 06 2021

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 9 22:38 EDT 2021. Contains 343746 sequences. (Running on oeis4.)