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Search: id:A092642
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| A092642 |
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Number of consecutive prime runs of 3 primes congruent to 1 mod 4 below 10^n. |
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+0
5
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OFFSET
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1,3
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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 3 primes occur before interruption by a prime congruent to 3 mod 4.
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EXAMPLE
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a(5)=305 because 305 sets of 3 primes occur below 10^5, each run interrupted by a prime congruent to 3 mod 4.
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CROSSREFS
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Cf. A092643 A092644.
Sequence in context: A003633 A129310 A152110 this_sequence A020865 A155859 A120974
Adjacent sequences: A092639 A092640 A092641 this_sequence A092643 A092644 A092645
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KEYWORD
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easy,more,nonn
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AUTHOR
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Enoch Haga (Enokh(AT)comcast.net), Mar 02 2004
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