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A057330 First member of a prime n-tuplet in a 2p-1 progression. 21
2, 2, 2, 1531, 1531, 16651, 16651, 15514861, 857095381, 205528443121, 1389122693971, 216857744866621, 758083947856951, 69257563144280941, 69257563144280941, 3203000719597029781 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Initial terms of A000040, A005382, A057326, A057327, A057328, A057329.

LINKS

Table of n, a(n) for n=1..16.

Dirk Augustin, Smallest existing Cunningham Chains of given length

Chris Caldwell, The Prime Glossary: Cunningham chain

Tony Forbes, Cunningham Chain of length 16, Dec 05 1997

Index entries for sequences related to primes in arithmetic progressions

CROSSREFS

See also A005603. Cf. A179866.

Sequence in context: A304463 A066736 A216668 * A207820 A186069 A280842

Adjacent sequences:  A057327 A057328 A057329 * A057331 A057332 A057333

KEYWORD

nonn,nice,more

AUTHOR

Patrick De Geest, Aug 15 2000

EXTENSIONS

More terms from Jean Gaumont (jeangaum87(AT)yahoo.com), Apr 16 2006

Offset corrected by Max Alekseyev, May 07 2009

a(16) found by Tony Forbes, added by Jens Kruse Andersen, Jun 14 2014

STATUS

approved

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Last modified November 14 23:27 EST 2018. Contains 317221 sequences. (Running on oeis4.)