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A072473 a(n) = prime(2*n) - prime(n). 14
1, 4, 8, 12, 18, 24, 26, 34, 38, 42, 48, 52, 60, 64, 66, 78, 80, 90, 96, 102, 108, 114, 116, 134, 132, 138, 148, 156, 162, 168, 166, 180, 180, 198, 200, 208, 216, 220, 230, 236, 242, 252, 252, 264, 266, 280, 280, 280, 294, 312, 324, 330, 336, 342, 344, 350, 350 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) > prime(n) for n > 1. - Charles R Greathouse IV, Nov 22 2013

Sequence is not monotonic. - Zak Seidov, Feb 15 2015

LINKS

Seiichi Manyama, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A066066(n) + A000040(n). - Reinhard Zumkeller, Jul 25 2010

MATHEMATICA

Table[ Prime[2n] - Prime[n], {n, 1, 60}]

PROG

(PARI) a(n) = prime(2*n) - prime(n); \\ Michel Marcus, Nov 22 2013

(MAGMA) [NthPrime(2*n) - NthPrime(n): n in [1..80]]; // Vincenzo Librandi, Feb 16 2015

CROSSREFS

Cf. A072715.

Sequence in context: A311621 A311622 A311623 * A072715 A311624 A311625

Adjacent sequences:  A072470 A072471 A072472 * A072474 A072475 A072476

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Jun 20 2002

EXTENSIONS

Edited by Robert G. Wilson v and Jim Nastos, Jun 21 2002

STATUS

approved

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Last modified August 12 16:40 EDT 2020. Contains 336439 sequences. (Running on oeis4.)