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 A093186 Number of consecutive runs of 2 odd nonprimes congruent to 3 mod 4 below 10^n. 6
 0, 4, 36, 307, 2848, 25651, 231031, 2106565 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS FORMULA Generate the odd nonprime sequence with nonprimes labeled 1 mod 4 or 3 mod 4. Add count of nonprimes to sequence if 2 nonprimes congruent to 3 mod 4 occur before interruption of a nonprime congruent to 1 mod 4 EXAMPLE a(3)=36 because 36 nonprime runs of 2 occur below 10^3, each run interrupted by a nonprime congruent to 1 mod 4. CROSSREFS Sequence in context: A059416 A108019 A222428 * A000765 A189334 A026334 Adjacent sequences:  A093183 A093184 A093185 * A093187 A093188 A093189 KEYWORD more,nonn AUTHOR Enoch Haga, Mar 30 2004 STATUS approved

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