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A092660
Number of consecutive prime runs of 9 primes congruent to 1 mod 4 below 10^n.
3
0, 0, 0, 0, 1, 6, 71, 851, 8919, 90049, 894724
OFFSET
1,6
FORMULA
Generate the prime sequence with primes labeled 1 mod 4 or 3 mod 4. Add count of primes to sequence if just 9 primes occur before interruption by a prime congruent to 3 mod 4.
EXAMPLE
a(6)=6 because 6 sets of 9 primes occur below 10^6, each run interrupted by a prime congruent to 3 mod 4.
CROSSREFS
Cf. A162865. [From Rick L. Shepherd, Jul 15 2009]
Sequence in context: A099339 A213530 A023038 * A186658 A341967 A371366
KEYWORD
more,nonn
AUTHOR
Enoch Haga, Mar 02 2004
EXTENSIONS
a(9) from Rick L. Shepherd, Jul 15 2009
a(10) from Sean A. Irvine, Oct 25 2011
a(11) from Chai Wah Wu, Mar 18 2018
STATUS
approved