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!)
A088824 Numbers n such that the sum of smallest prime factors of numbers from 1 to n is divisible by n. 5
1, 2, 7, 14, 78, 113, 153, 439, 462, 1215, 2294, 8363, 11102, 12302, 36382, 38370, 60398, 199953, 224090, 421399, 427131, 1947938, 2467022, 2571633, 62395623, 462027217, 2140648015, 6418011931, 43074345625, 52714450814, 71229445182, 90719472005, 105685014433 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Giovanni Resta, Table of n, a(n) for n = 1..38 (terms < 7.5*10^12)

FORMULA

Solutions to Mod[A088821[x], x]=0.

MATHEMATICA

smp[n_] := If[n==1, 0, FactorInteger[n][[1, 1]]]; s = Accumulate @ Array[ smp, 10^5]; Select[Range[10^5], Mod[s[[#]], #] == 0 &] (* Giovanni Resta, Apr 27 2017 *)

CROSSREFS

Cf. A088821-A088825.

Sequence in context: A018764 A018780 A132997 * A034903 A070898 A132746

Adjacent sequences:  A088821 A088822 A088823 * A088825 A088826 A088827

KEYWORD

nonn

AUTHOR

Labos Elemer, Oct 22 2003

EXTENSIONS

More terms from Ray Chandler, Oct 31 2003

a(27)-a(31) from Donovan Johnson, Jul 09 2010

a(32)-a(33) from Giovanni Resta, Apr 27 2017

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 April 19 20:37 EDT 2021. Contains 343117 sequences. (Running on oeis4.)