login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A001749 Primes multiplied by 4. 18
8, 12, 20, 28, 44, 52, 68, 76, 92, 116, 124, 148, 164, 172, 188, 212, 236, 244, 268, 284, 292, 316, 332, 356, 388, 404, 412, 428, 436, 452, 508, 524, 548, 556, 596, 604, 628, 652, 668, 692, 716, 724, 764, 772, 788, 796, 844, 892, 908, 916, 932, 956, 964, 1004, 1028, 1052, 1076, 1084, 1108, 1124, 1132, 1172, 1228, 1244, 1252 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

n such that sum(d|n,(-1)^d)=A048272(n)=2. - Benoit Cloitre, Apr 14 2002

Solutions of the differential equation n'=n+4, where n' is the arithmetic derivative of n. - Paolo P. Lava, Feb 02 2012

LINKS

Paolo P. Lava, Table of n, a(n) for n = 1..20000

MATHEMATICA

4 * Prime[Range[66]] (* Vladimir Joseph Stephan Orlovsky, Apr 29 2008 *)

PROG

(Haskell)

a001749 = (* 4) . a000040  -- Reinhard Zumkeller, Feb 20 2012

(PARI) a(n)=4*prime(n) \\ Charles R Greathouse IV, Mar 25 2014

(MAGMA) [4*p: p in PrimesUpTo(300)]; // Vincenzo Librandi, Mar 26 2014

(PARI) 4 * primes(66) \\ Joerg Arndt, Mar 26 2014

CROSSREFS

Sequence in context: A232867 A084488 A211410 * A175786 A258848 A072843

Adjacent sequences:  A001746 A001747 A001748 * A001750 A001751 A001752

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

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 17 08:36 EDT 2019. Contains 328107 sequences. (Running on oeis4.)