A088257 Primorials P which have at least one prime neighbor; i.e., P+1 or P-1 or both are primes.

1, 2, 6, 30, 210, 2310, 30030, 200560490130, 304250263527210, 23768741896345550770650537601358310

Offset: 1

Author

Amarnath Murthy, Sep 27 2003

Keywords

• nonn

Comments

A supersequence of A088256.

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

Links

• Alois P. Heinz, Table of n, a(n) for n = 1..19

Crossrefs

Cf. A002110, A088256.

Programs

Mathematica

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

Extensions

More terms from Ray Chandler, Sep 28 2003