A092655 Number of consecutive prime runs of 7 primes congruent to 3 mod 4 below 10^n.

0, 0, 1, 1, 6, 56, 575, 5427, 52548, 506986, 4857159

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 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

Cf. A092654, A092656.

Sequence in context: A183615 A181589 A093142 * A099140 A371739 A048348

Adjacent sequences: A092652 A092653 A092654 * A092656 A092657 A092658

Keyword

more,nonn

Author

Enoch Haga, Mar 02 2004

Extensions

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

Status

approved