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A092660
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Number of consecutive prime runs of 9 primes congruent to 1 mod 4 below 10^n.
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3
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0, 0, 0, 0, 1, 6, 71, 851, 8919, 90049, 894724
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OFFSET
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1,6
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LINKS
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FORMULA
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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.
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EXAMPLE
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a(6)=6 because 6 sets of 9 primes occur below 10^6, each run interrupted by a prime congruent to 3 mod 4.
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CROSSREFS
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KEYWORD
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more,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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