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A115168 Even numbers n such that n-2 and n+2 have the same number of prime divisors with multiplicity. 1
8, 10, 12, 24, 36, 38, 58, 60, 68, 84, 86, 100, 102, 110, 112, 120, 134, 138, 144, 154, 172, 178, 184, 188, 204, 216, 230, 240, 244, 276, 284, 288, 300, 302, 320, 342, 346, 360, 368, 372, 374, 378, 384, 394, 396, 404, 408, 428, 432, 436, 440, 456, 466, 472 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

MAPLE

g(n) = forstep(x=4, n, 2, p1=bigomega(x-2); p2=bigomega(x+2); if(p1==p2, print(x", ")))

MATHEMATICA

Select[Range[4, 472, 2],  PrimeOmega[# - 2] ==  PrimeOmega[# + 2] &] (* Amiram Eldar, Sep 23 2019 *)

2*Mean/@SequencePosition[Table[PrimeOmega[n], {n, 2, 500, 2}], {x_, _, x_}] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jun 20 2021 *)

CROSSREFS

Sequence in context: A114873 A114621 A174156 * A303223 A112549 A112585

Adjacent sequences:  A115165 A115166 A115167 * A115169 A115170 A115171

KEYWORD

easy,nonn

AUTHOR

Cino Hilliard, Mar 03 2006

STATUS

approved

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Last modified June 30 02:41 EDT 2022. Contains 354913 sequences. (Running on oeis4.)