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A001749 Primes multiplied by 4. 21
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

Numbers k such that Sum_{d|k} (-1)^d = A048272(k) = 2. - Benoit Cloitre, Apr 14 2002

Solutions of k'=k+4, where k' is the arithmetic derivative of k. - 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

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

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

CROSSREFS

Cf. A000040, A003415, A048272.

Sequence in context: A084488 A337877 A211410 * A175786 A258848 A072843

Adjacent sequences:  A001746 A001747 A001748 * A001750 A001751 A001752

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified August 15 20:27 EDT 2022. Contains 356148 sequences. (Running on oeis4.)