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

a(3)=36 because 36 nonprime runs of 2 occur below 10^3, each run interrupted by a nonprime congruent to 1 mod 4.

Cf. A093183 A093184 A093185 A093187 A093188 A093397 A093398 A093399 A092640.

Sequence in context: A098916 A059416 A108019 this_sequence A000765 A026334 A163455

Adjacent sequences: A093183 A093184 A093185 this_sequence A093187 A093188 A093189

easy,more,nonn

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