1,4

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

a(4)=5 because in A092645 the count is 10 and in A092646 the count is 15. 15-10=5.

Cf. A092645 A092646.

Sequence in context: A106587 A034509 A034521 this_sequence A006561 A126359 A107144

Adjacent sequences: A092644 A092645 A092646 this_sequence A092648 A092649 A092650

easy,more,nonn

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