1,3

Take the absolute value of differences between counts of runs of 3 odd nonprimes congruent to 1 mod 4 and 3 mod 4

a(3)=5 because in A093187 the count is 10 and in A093188 the count is 5. 10-5=5.

Cf. A093187 A093188 A092642 A092643 A092644.

Sequence in context: A157101 A091001 A078811 this_sequence A123233 A128191 A043299

Adjacent sequences: A093396 A093397 A093398 this_sequence A093400 A093401 A093402

easy,more,nonn

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