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A093187 Number of consecutive runs of 3 odd nonprimes congruent to 1 mod 4 below 10^n. 6
0, 1, 10, 53, 390, 2794, 21215, 167055 (list; graph; refs; listen; history; internal format)
OFFSET

1,3

FORMULA

Generate the odd nonprime sequence with nonprimes labeled 1 mod 4 or 3 mod 4. Add count of nonprimes to sequence if 3 nonprimes congruent to 1 mod 4 occur before interruption of a nonprime congruent to 3 mod 4.

EXAMPLE

a(3)=10 because 10 nonprime runs of 3 occur below 10^3, each run interrupted by a nonprime congruent to 3 mod 4

CROSSREFS

Cf. A093183 A093184 A093185 A093186 A093188 A093397 A093398 A093399 A092642.

Sequence in context: A063899 A006889 A007035 * A152762 A161458 A162248

Adjacent sequences:  A093184 A093185 A093186 * A093188 A093189 A093190

KEYWORD

more,nonn

AUTHOR

Enoch Haga (Enokh(AT)comcast.net), Mar 30 2004

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Last modified February 17 14:50 EST 2012. Contains 206050 sequences.