1,3

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

a(3)=3 because in A092642 the count is 4 and in A092643 the count is 1. 4-1=3.

Cf. A092642 A092643.

Sequence in context: A126354 A158939 A026345 this_sequence A006281 A157705 A078073

Adjacent sequences: A092641 A092642 A092643 this_sequence A092645 A092646 A092647

easy,more,nonn

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