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A120120
Number of n-digit prime quadruplets.
3
1, 3, 7, 26, 128, 733, 3869, 23620, 152141, 1028789, 7188960, 51672312, 381226246, 2873279651
OFFSET
2,2
EXAMPLE
a(3) = 3 because there are three three-digit prime quadruples: {101, 103, 107, 109}, {191, 193, 197, 199} and {821, 823, 827, 829}.
CROSSREFS
KEYWORD
nonn,more,base
AUTHOR
Julien Peter Benney (jpbenney(AT)ftml.net), Aug 15 2006, Aug 19 2006
EXTENSIONS
a(6) corrected and a(15) supplied by Jon E. Schoenfield, Aug 27 2006
STATUS
approved