A144264 -id:A144264 - cp's OEIS frontend

A144359 Numbers k such that A144264(k) = A144264(k+1).

1, 20, 94, 103, 130, 556, 1048, 1330, 1359, 3147, 3599, 5963, 9248, 13855, 24264, 29098, 29099, 30697, 39854, 66568, 83730, 150837, 150936, 300494, 334988, 520570, 594503, 599351, 755245, 1191160, 1301954, 1367359, 1882594, 1922588, 2139916, 3290986, 4588774, 6124282

Offset: 1

Zak Seidov, Sep 18 2008

nonn

Numbers k such that A014085(k) = A014085(k+1) = A014085(k+2).

Cf. A014085 (Number of primes between n^2 and (n+1)^2), A144264 (Numbers k such that A014085(k) = A014085(k+1)).

a(26)-a(31) from Amiram Eldar, Feb 23 2020

a(32)-a(38) from Giovanni Resta, Feb 23 2020

A163161 Values of n at which the sequence A161865/A161867 equals 1/2.

Original entry on oeis.org

5, 9, 14, 30, 44, 47, 64, 67, 72, 89, 99, 124, 125, 194, 198, 200, 208, 213, 214, 249, 267, 270, 320, 333, 372, 373, 374, 393, 455, 460, 475, 519, 586, 603, 643, 701, 704, 712, 770, 774, 789, 814, 825, 828, 836, 891, 906, 930, 941, 970, 974, 982, 983, 988, 1022

Offset: 1

Daniel Tisdale, Jul 21 2009, Jul 24 2009

nonn

The corresponding sequence for primes is A144264, and the ratio is given by sequences A161621/A161622.

t1 = Table[ ((2n+1) - (PrimePi[(n+1)^2] - PrimePi[n^2]))/((4n+4)- (PrimePi[(n+2)^2] - PrimePi[n^2])), {n,1,300}]; t2= Position[t1, 1/2] (* Daniel Tisdale, Jul 24 2009 *)

Corrected by the author, Jul 25 2009

Extended beyond 194 by R. J. Mathar, Sep 27 2009

cp's OEIS Frontend

A144359 Numbers k such that A144264(k) = A144264(k+1).

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