1,3

Take the absolute value of differences between counts of runs of 2 nonprimes congruent to 1 mod 4 and 3 mod 4

a(3)=3 because in A093185 the count is 33 and in A093186 the count is 36. 36-33=3.

Cf. A093185 A093186 A092639 A092640 A092641.

Sequence in context: A009084 A096057 A065085 this_sequence A002680 A009395 A093892

Adjacent sequences: A093395 A093396 A093397 this_sequence A093399 A093400 A093401

nonn

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