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A092654 Number of consecutive prime runs of 7 primes congruent to 1 mod 4 below 10^n. 2
0, 0, 0, 0, 2, 45, 553, 5336, 52807, 508378, 4855972 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..11.

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 3 mod 4.

EXAMPLE

a(5)=2 because 2 sets of 7 primes occur below 10^5, each run interrupted by a prime congruent to 3 mod 4.

CROSSREFS

Cf. A092655, A092656.

Sequence in context: A151583 A325935 A222997 * A209606 A100101 A332244

Adjacent sequences:  A092651 A092652 A092653 * A092655 A092656 A092657

KEYWORD

more,nonn

AUTHOR

Enoch Haga, Mar 02 2004

EXTENSIONS

a(9)-a(11) from Chai Wah Wu, Mar 18 2018

STATUS

approved

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Last modified September 25 20:01 EDT 2021. Contains 347659 sequences. (Running on oeis4.)