A092660 -id:A092660 - cp's OEIS frontend

A092662 Absolute value of difference between counts of uninterrupted runs of 9 primes in A092660 and A092661.

0, 0, 0, 0, 0, 2, 6, 46, 30, 227, 227

Offset: 1

Enoch Haga, Mar 02 2004

			a(8)=46 because in A092660 the count is 851 and in A092661 the count is 897. 897-851=46.

Cf. A092660, A092661.

Take the absolute value of the difference between counts of runs of 9 primes congruent to 1 mod 4 and 3 mod 4.

a(9) from Rick L. Shepherd, Jul 15 2009
a(10) from Sean A. Irvine, Oct 25 2011
a(11) from Chai Wah Wu, Mar 18 2018

A092661 Number of consecutive prime runs of 9 primes congruent to 3 mod 4 below 10^n.

Original entry on oeis.org

0, 0, 0, 0, 1, 8, 77, 897, 8949, 90276, 894951

Offset: 1

Enoch Haga, Mar 02 2004

			a(7)=77 because 77 sets of 9 primes occur below 10^7, each run interrupted by a prime congruent to 1 mod 4.

Cf. A092660 A092662.

Cf. A162866. [From Rick L. Shepherd, Jul 15 2009]

Generate the prime sequence with primes labeled 1 mod 4 or 3 mod 4. Add count of primes to sequence if just 9 primes occur before interruption by a prime congruent to 1 mod 4

a(9) from Rick L. Shepherd, Jul 15 2009
a(10) from Sean A. Irvine, Oct 25 2011
a(11) from Chai Wah Wu, Mar 18 2018

A162865 Initial prime of exactly nine consecutive primes congruent to 1 modulo 4.

Original entry on oeis.org

11593, 206953, 315257, 541097, 906541, 992393, 1124993, 1410361, 1595081, 1781569, 1872049, 2043329, 2090353, 2312749, 2381657, 2481509, 2497289, 2718389, 2758109, 2772409, 2976397, 3863473, 3868849, 4027957, 4042673, 4375141, 4464841, 4547581, 4606153

Offset: 1

Rick L. Shepherd, Jul 15 2009

The table provides all 8919 [=A092660(9)] terms less than 10^9.

If 10 or more consecutive primes are all congruent to 1 modulo 4, none of them is a member of this sequence. - Harvey P. Dale, Oct 23 2011

Rick L. Shepherd, Table of n, a(n) for n=1..8919

Cf. A092660, A162866, A055623, A057624, A054678.

m9Q[l_]:=Module[{ms=Mod[l,4]},First[ms]!=1&&Last[ms]!=1&&Union[Take[ ms,{2,10}]]=={1}]; Transpose[Select[Partition[ Prime[Range[ 290000]], 11,1],m9Q]][[2]] (* Harvey P. Dale, Oct 23 2011 *)

cp's OEIS Frontend

A092662 Absolute value of difference between counts of uninterrupted runs of 9 primes in A092660 and A092661.

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A092661 Number of consecutive prime runs of 9 primes congruent to 3 mod 4 below 10^n.

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Extensions

A162865 Initial prime of exactly nine consecutive primes congruent to 1 modulo 4.

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