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!)
A048148 Distinct elements of A045948. 4
1, 2, 4, 12, 24, 120, 360, 720, 5040, 10080, 30240, 332640, 1663200, 3326400, 43243200, 129729600, 259459200, 4410806400, 30875644800, 586637251200, 1173274502400, 26985313555200, 134926567776000, 404779703328000, 11738611396512000, 363896953291872000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A001222(a(n)) = n - 1. - Eric Desbiaux, Apr 05 2018

LINKS

Michael De Vlieger, Table of n, a(n) for n = 1..237

FORMULA

A025476(n) = a(n+1) / a(n). - Eric Desbiaux, Jun 22 2013

MATHEMATICA

Map[Function[m, Exp[Sum[MangoldtLambda@ n, {n, m}]]/Product[x, {x, Prime@ Range@ PrimePi@ m}]], Select[Range[10^3], Or[# == 1, And[PrimePowerQ@ #, ! PrimeQ@ #]] &] ] (* Michael De Vlieger, Aug 01 2017, after Fred Daniel Kline at A045948 *)

CROSSREFS

Cf. A003418, A034386, A002110, A000142, A049536.

Sequence in context: A066843 A051905 A051426 * A080375 A136253 A266079

Adjacent sequences:  A048145 A048146 A048147 * A048149 A048150 A048151

KEYWORD

nonn

AUTHOR

Labos Elemer

EXTENSIONS

More terms from James A. Sellers, May 03 2000

More terms from Michael De Vlieger, Aug 01 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 October 16 20:36 EDT 2021. Contains 348047 sequences. (Running on oeis4.)