1,2

Take the absolute value of the difference between counts of runs of 2 primes congruent to 1 mod 4 and 3 mod 4.

a(2)=3 because in A092639 the count is 2 and in A092640 the count is 5. 5-3=2.

Cf. A092639 A092640.

Sequence in context: A034464 A116696 A000220 this_sequence A077449 A152232 A141023

Adjacent sequences: A092638 A092639 A092640 this_sequence A092642 A092643 A092644

easy,more,nonn

Enoch Haga (Enokh(AT)comcast.net), Mar 02 2004