The numbers
References
Ribenboim, P. ``The NSW Primes.'' §5.9 in The New Book of Prime Number Records.
New York: Springer-Verlag, pp. 367-369, 1996.
Sloane, N. J. A. Sequences
A002315/M4423
and A005850/M2426
in ``An On-Line Version of the Encyclopedia of Integer Sequences.''
http://www.research.att.com/~njas/sequences/eisonline.html and Sloane, N. J. A. and Plouffe, S.
The Encyclopedia of Integer Sequences. San Diego: Academic Press, 1995.