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A151612 Values of k arising in A160518: numbers k such that (2*k^3 - 1, 2*k^3 + 1) are twin primes. 2
6, 21, 99, 120, 249, 354, 375, 435, 600, 609, 675, 720, 804, 819, 906, 915, 1080, 1215, 1230, 1359, 1671, 1740, 1794, 1995, 2250, 2349, 2421, 2430, 2469, 2625, 2664, 2754, 2805, 2826, 2949, 3090, 3225, 3291, 3546, 3879, 4200, 4506, 4761, 4896, 5241, 5271 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
{n: 2*n^3-1 in A001359}. - R. J. Mathar, May 29 2009
EXAMPLE
6 is a term since 2 * 6^3 = 432 and 431 and 433 are twin primes.
MAPLE
isA001359 := proc(n) RETURN(isprime(n) and isprime(n+2)) ; end: for n from 1 to 8000 do twon3 := 2*n^3 ; if isA001359(twon3-1) then printf("%d, ", n) ; fi; od: # R. J. Mathar, May 29 2009
MATHEMATICA
Select[3*Range[2000], And @@ PrimeQ[2*#^3 + {-1, 1}] &] (* Amiram Eldar, Dec 28 2019 *)
CROSSREFS
Sequence in context: A369556 A009247 A093774 * A344496 A012773 A012662
KEYWORD
nonn
AUTHOR
Howard Berman (howard_berman(AT)hotmail.com), May 16 2009
EXTENSIONS
More terms from R. J. Mathar, May 29 2009
STATUS
approved

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Last modified July 20 20:25 EDT 2024. Contains 374459 sequences. (Running on oeis4.)