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A111981 Numbers n such that 2n-1 and 2n+3 are consecutive primes. 2
4, 7, 10, 19, 22, 34, 40, 49, 52, 55, 64, 82, 97, 112, 115, 139, 154, 157, 175, 190, 199, 220, 229, 232, 244, 250, 307, 322, 337, 370, 379, 385, 412, 427, 430, 439, 442, 454, 469, 484, 505, 544, 547, 607, 640, 649, 652, 712, 715, 724, 742, 745, 775, 784, 790 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..55.

FORMULA

a(n) = (A029708(n)-1)/2 = (A029710(n)+1)/2 = (A031505(n)-3)/2.

CROSSREFS

Essentially the same as A088762.

Sequence in context: A088408 A027752 A161334 * A080922 A227686 A161863

Adjacent sequences:  A111978 A111979 A111980 * A111982 A111983 A111984

KEYWORD

nonn

AUTHOR

Ray Chandler, Aug 24 2005

STATUS

approved

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Last modified June 19 06:47 EDT 2019. Contains 324218 sequences. (Running on oeis4.)