A104373 Numbers m such that (A104350(m)-1, A104350(m)+1) is a twin prime pair.

3, 4, 5, 6, 9, 11

Offset

1,1

Comments

No more terms < 2000. - David Wasserman, Apr 24 2008

a(7) > 5000, if it exists. - Amiram Eldar, Apr 08 2024

Links

Table of n, a(n) for n=1..6.

Example

a(5)=9: A104350(9) = 2*3*2*5*3*7*2*3 = 7560, A000040(959) = 7559 = 7560-1, A000040(960) = 7561 = 7560+1.

Mathematica

Position[FoldList[Times, Array[FactorInteger[#][[-1, 1]] &, 100]], _?(PrimeQ[# - 1] && PrimeQ[# + 1] &)] // Flatten (* Amiram Eldar, Apr 08 2024 *)

Crossrefs

Cf. A104350, A104357, A104364, A104365, A104372.

Cf. A001359, A006512, A014574.

Sequence in context: A266322 A136681 A206330 * A047427 A228235 A228895

Adjacent sequences: A104370 A104371 A104372 * A104374 A104375 A104376

Keyword

nonn,more

Author

Reinhard Zumkeller, Mar 06 2005

Status

approved