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A173165 Numbers k such that 2*k^2 -+ 1 is a twin prime pair. 2
3, 6, 21, 24, 36, 42, 45, 87, 102, 132, 153, 186, 204, 228, 237, 273, 297, 300, 321, 375, 426, 441, 468, 486, 489, 519, 570, 606, 636, 693, 735, 756, 759, 792, 885, 918, 951, 990, 993, 1065, 1098, 1128, 1131, 1158, 1191, 1326, 1344, 1359, 1386, 1407, 1443 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A001105(k+1) -+ 1 is a twin prime pair.

LINKS

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

FORMULA

a(n) = 3*A037073(n) = A154670(n)/6.

MATHEMATICA

Select[Range[1500], And @@ PrimeQ[2*#^2 + {-1, 1}] &] (* Amiram Eldar, Dec 20 2019 *)

CROSSREFS

Cf. A001105, A014574, A037073, A154670.

Sequence in context: A064366 A260157 A101719 * A210504 A101582 A069558

Adjacent sequences:  A173162 A173163 A173164 * A173166 A173167 A173168

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov, Feb 11 2010

EXTENSIONS

Entries checked by R. J. Mathar, Mar 09 2010

STATUS

approved

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Last modified December 9 06:07 EST 2021. Contains 349627 sequences. (Running on oeis4.)