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A092655
Number of consecutive prime runs of 7 primes congruent to 3 mod 4 below 10^n.
2
0, 0, 1, 1, 6, 56, 575, 5427, 52548, 506986, 4857159
OFFSET
1,5
FORMULA
Generate the prime sequence with primes labeled 1 mod 4 or 3 mod 4. Add count of primes to sequence if just 7 primes occur before interruption by a prime congruent to 1 mod 4.
EXAMPLE
a(5)=6 because 6 sets of 7 primes occur below 10^5, each run interrupted by a prime congruent to 1 mod 4.
CROSSREFS
Sequence in context: A183615 A181589 A093142 * A099140 A371739 A048348
KEYWORD
more,nonn
AUTHOR
Enoch Haga, Mar 02 2004
EXTENSIONS
a(9)-a(11) from Chai Wah Wu, Mar 18 2018
STATUS
approved