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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 Amiram Eldar, Table of n, a(n) for n = 1..10000 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 Cf. A001359, A160518. Sequence in context: A369556 A009247 A093774 * A344496 A012773 A012662 Adjacent sequences: A151609 A151610 A151611 * A151613 A151614 A151615 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.)