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A092640
Number of consecutive prime runs of 2 primes congruent to 3 mod 4 below 10^n.
5
0, 5, 20, 101, 751, 5949, 49010, 418366, 3627049, 32067600, 287357618
OFFSET
1,2
FORMULA
Generate the prime sequence with primes labeled 1 mod 4 or 3 mod 4. Add count of primes to sequence if just 2 primes occur before interruption by a prime congruent to 1 mod 4.
EXAMPLE
a(4)=101 because 101 pairs of primes occur below 10^4, each run interrupted by a prime congruent to 1 mod 4.
CROSSREFS
Sequence in context: A108509 A110595 A369488 * A165961 A276314 A292358
KEYWORD
more,nonn
AUTHOR
Enoch Haga, Mar 02 2004
EXTENSIONS
a(9)-a(11) from Chai Wah Wu, Mar 18 2018
STATUS
approved