1,3

Generate the odd nonprime sequence with nonprimes labeled 1 mod 4 or 3 mod 4. Add count of nonprimes to sequence if 3 nonprimes congruent to 1 mod 4 occur before interruption of a nonprime congruent to 3 mod 4.

a(3)=10 because 10 nonprime runs of 3 occur below 10^3, each run interrupted by a nonprime congruent to 3 mod 4

Cf. A093183 A093184 A093185 A093186 A093188 A093397 A093398 A093399 A092642.

Sequence in context: A063899 A006889 A007035 this_sequence A053347 A036600 A058645

Adjacent sequences: A093184 A093185 A093186 this_sequence A093188 A093189 A093190

easy,more,nonn

Enoch Haga (Enokh(AT)comcast.net), Mar 30 2004