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A069479 Smallest n-tuply-lonely non-twin prime. 0
23, 1039, 403026797, 121829611399 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(3) found by Hans Havermann; a(4) by Phil Carmody.

LINKS

Table of n, a(n) for n=1..4.

EXAMPLE

An n-tuply lonely non-twin prime is a non-twin prime that is sandwiched between exactly n pairs of prime twins on both sides. a(2)=1039 because 1039 is the first non-twin to be sandwiched between exactly 2 pairs of twins on each side (1019,1021,1031,1033 and 1049,1051,1061,1063).

CROSSREFS

Cf. A007510, A069453, A069456.

Sequence in context: A077283 A167244 A130551 * A174748 A042015 A042012

Adjacent sequences:  A069476 A069477 A069478 * A069480 A069481 A069482

KEYWORD

hard,nonn

AUTHOR

Neil Fernandez, Mar 25 2002

STATUS

approved

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Last modified March 23 18:13 EDT 2019. Contains 321433 sequences. (Running on oeis4.)