A375198 Numbers k such that A025487(k)-1 and A025487(k)+1 are twin primes.

3, 4, 6, 9, 13, 15, 20, 21, 24, 29, 30, 42, 54, 56, 59, 72, 77, 83, 96, 104, 105, 109, 138, 161, 166, 174, 186, 203, 208, 221, 232, 237, 266, 270, 288, 295, 336, 338, 347, 387, 389, 395, 400, 401, 449, 468, 469, 472, 479, 506, 520, 543, 584, 617, 633, 643, 668

Offset

1,1

Links

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

Formula

A025487(a(n)) = A375197(n).

Mathematica

Position[Cases[Import["https://oeis.org/A025487/b025487.txt", "Table"], {_, _}][[;; , 2]], _?(PrimeQ[# - 1] && PrimeQ[# + 1] &)] // Flatten

Crossrefs

Cf. A001097, A001359, A006512, A014574, A025487, A375197.

Similar sequences: A321995, A353302.

Sequence in context: A140570 A285303 A135072 * A032720 A289117 A355697

Adjacent sequences: A375195 A375196 A375197 * A375199 A375200 A375201

Keyword

nonn

Author

Amiram Eldar, Aug 04 2024

Status

approved