A039639 Fixed point of "k -> k/2 or (k-1)/2 until result is prime", starting with prime(n)+1.

3, 2, 3, 2, 3, 7, 2, 5, 3, 7, 2, 19, 5, 11, 3, 13, 7, 31, 17, 2, 37, 5, 5, 11, 3, 3, 13, 13, 13, 7, 2, 2, 17, 17, 37, 19, 79, 41, 5, 43, 11, 11, 3, 97, 3, 3, 53, 7, 7, 7, 29, 7, 7, 31, 2, 2, 67, 17, 139, 17, 71, 73, 19, 19, 157, 79, 83, 5, 43, 43, 11, 11, 23, 23, 47, 3, 97, 199, 3

Offset

1,1

Links

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Mathematica

see A039634.

Prog

(Haskell)
a039639 = until ((== 1) . a010051) (flip div 2) . (+ 1) . a000040
-- Reinhard Zumkeller, Nov 17 2013

Crossrefs

Cf. A039634-A039645.

Cf. A010051, A000040, A039643, A039641, A039634.

Sequence in context: A018837 A097618 A368276 * A023509 A115041 A039641

Adjacent sequences: A039636 A039637 A039638 * A039640 A039641 A039642

Keyword

nonn

Author

Wouter Meeussen

Extensions

Offset corrected by Reinhard Zumkeller, Nov 17 2013

Status

approved