1,2

Generate the odd nonprime sequence with nonprimes labeled 1 mod 4 or 3 mod 4. Add count of nonprimes to sequence if 2 nonprimes congruent to 1 mod 4 occur before interruption of a nonprime congruent to 3 mod 4.

a(3)=33 because 33 nonprime runs of 2 occur below 10^3, each run interrupted by a nonprime congruent to 3 mod 4

Cf. A093183 A093184 A093186 A093187 A093187 A093188 A093397 A093398 A093399 A092639.

Sequence in context: A123780 A054371 A028576 this_sequence A075132 A113170 A156132

Adjacent sequences: A093182 A093183 A093184 this_sequence A093186 A093187 A093188

easy,more,nonn

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