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A088257 Primorials P which have at least one prime neighbor; i.e., P+1 or P-1 or both are primes. 4
1, 2, 6, 30, 210, 2310, 30030, 200560490130, 304250263527210, 23768741896345550770650537601358310 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A supersequence of A088256.

Next term a(11) is 131 digits and is too large to include.

LINKS

Table of n, a(n) for n=1..10.

MATHEMATICA

Select[FoldList[Times, 1, Prime[Range[70]]], PrimeQ[#-1]||PrimeQ[#+1]&] (* Harvey P. Dale, Oct 22 2011 *)

CROSSREFS

Cf. A088256.

Sequence in context: A233438 A002110 A118491 * A058694 A046853 A136351

Adjacent sequences:  A088254 A088255 A088256 * A088258 A088259 A088260

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Sep 27 2003

EXTENSIONS

More terms from Ray Chandler, Sep 28 2003

STATUS

approved

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Last modified July 21 00:39 EDT 2019. Contains 325189 sequences. (Running on oeis4.)