A093181 -id:A093181 - cp's OEIS frontend

A093180 Odd composites (including 1 in the count) where the number 1 mod 4 equals the number 3 mod 4.

26829, 26845, 26853, 26857, 26865, 26869, 26873, 26877, 26885, 26889, 26897, 26917, 616765, 616773, 616777, 616785, 616825, 616833, 616837, 616845, 616853, 616857, 616861, 616865, 616869, 616873, 616881, 616885, 616889, 616893, 617013

Offset: 1

Enoch Haga, Mar 27 2004

This odd composite race seems analogous to the prime number race

			a(1)=26829 is the first odd composite 1 mod 4 where the count 5238 is the same for 26835 3 mod 4

Cf. A007350, A007351, A038691, A093181, A093182.

Beginning with 1, run separate counts for odd composites 1 mod 4 and 3 mod 4. When the count is equal, record the number for 1 mod 4.

A093182 Counts where both the odd composites (starting from 1) 1 mod 4 and 3 mod 4 are equal.

Original entry on oeis.org

5238, 5241, 5242, 5243, 5244, 5245, 5246, 5247, 5248, 5249, 5250, 5255, 129008, 129009, 129010, 129012, 129020, 129021, 129022, 129023, 129024, 129025, 129026, 129027, 129028, 129029, 129030, 129031, 129032, 129033, 129058, 129059, 129060

Offset: 1

Enoch Haga, Mar 27 2004

			At 26829 1 mod 4 and 26835 3 mod 4, the count of odd composites is equal for each run at 5238; so a(1)=5238. [Compare to the prime 26833 1 mod 4 where equality occurs at count 1471 and the first reversal in the race occurs at 26861.]

Cf. A093180, A093181, A007350, A007351, A038691.

Run separate counts of odd composites 1 mod 4 and 3 mod 4. When the count is equal, record the count.

cp's OEIS Frontend

A093180 Odd composites (including 1 in the count) where the number 1 mod 4 equals the number 3 mod 4.

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