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.

Table of n, a(n) for n=1..10.

a(n) = abs(A092646(n) - A092645(n)). - Michel Marcus, Jun 03 2014

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: A034509 A034521 A294841 * A171262 A006561 A146845

Adjacent sequences: A092644 A092645 A092646 * A092648 A092649 A092650

more,nonn

Enoch Haga, Mar 02 2004

a(9)-a(10), using A092645 and A092646, from Michel Marcus, Jun 03 2014

approved