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A144264 Numbers n such that A014085(n)=A014085(n+1). 3
1, 2, 12, 18, 20, 21, 29, 36, 59, 66, 71, 73, 88, 90, 94, 95, 103, 104, 109, 128, 130, 131, 161, 166, 170, 209, 234, 250, 292, 299, 307, 318, 332, 353, 362, 375, 377, 391, 481, 509, 556, 557, 564, 577, 602, 619, 630, 665, 670, 684, 698, 728, 792, 808, 840 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Numbers n such that number of primes between n^2 and (n+1)^2 is equal to number of primes between (n+1)^2 and (n+2)^2.

Conjecture: the sequence is infinite.

LINKS

Zak Seidov, Table of n, a(n) for n=1..2000

MATHEMATICA

Flatten[Position[Partition[PrimePi[Range[1000]^2], 3, 1], _?(Length[Union[ Differences[#]]]==1&), {1}, Heads->False]] (* Harvey P. Dale, Jun 17 2014 *)

CROSSREFS

Cf. A014085

Sequence in context: A266802 A082407 A063576 * A277961 A294998 A323762

Adjacent sequences:  A144261 A144262 A144263 * A144265 A144266 A144267

KEYWORD

nonn

AUTHOR

Zak Seidov, Sep 16 2008, Sep 17 2008

STATUS

approved

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Last modified September 18 07:58 EDT 2019. Contains 327168 sequences. (Running on oeis4.)