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 3 mod 4 occur before interruption of a nonprime congruent to 1 mod 4

a(3)=5 because 5 nonprime runs of 3 occur below 10^3, each run interrupted by a nonprime congruent to 1 mod 4.

Cf. A093183 A093184 A093185 A093186 A093187 A093397 A093398 A093399 A092643.

Sequence in context: A007406 A058927 A083224 this_sequence A155629 A096596 A146311

Adjacent sequences: A093185 A093186 A093187 this_sequence A093189 A093190 A093191

easy,more,nonn

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