OFFSET
1,4
FORMULA
Generate the prime sequence with primes labeled 1 mod 4 or 3 mod 4. Add count of primes to sequence if just 5 primes occur before interruption by a prime congruent to 1 mod 4.
EXAMPLE
a(6)=396 because 396 sets of 5 primes occur below 10^6, each run interrupted by a prime congruent to 1 mod 4.
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Enoch Haga, Mar 02 2004
EXTENSIONS
a(9)-(11) from Chai Wah Wu, Mar 18 2018
STATUS
approved