A127964 Number of 0's in A127962(n).

0, 1, 2, 4, 5, 7, 8, 10, 14, 20, 29, 38, 49, 62, 82, 94, 98, 155, 172, 349, 853, 1307, 1768, 2902, 5249, 5344, 5638, 6194, 7238

Offset

1,3

Comments

Apparently n such that (2^(2*n+3)+1)/3 is prime. - James R. Buddenhagen, Apr 14 2011

Links

Table of n, a(n) for n=1..29.

Formula

a(n) = A023416(A000979(n)). - Michel Marcus, Nov 07 2013

Mathematica

b = {}; Do[c = 1 + Sum[2^(2n - 1), {n, 1, x}]; If[PrimeQ[c], AppendTo[b, c]], {x, 0, 1000}]; a = {}; Do[AppendTo[a, FromDigits[IntegerDigits[b[[x]], 2]]], {x, 1, Length[b]}]; d = {}; Do[AppendTo[d, DigitCount[a[[x]], 10, 0]], {x, 1, Length[a]}]; d (*Artur Jasinski*)

Crossrefs

Cf. A127962, A127961, A000979, A000978, A124400, A126614, A127955, A127956, A127957, A127958, A127936.

Sequence in context: A018519 A050054 A018371 * A269929 A364238 A085370

Adjacent sequences: A127961 A127962 A127963 * A127965 A127966 A127967

Keyword

nonn

Author

Artur Jasinski, Feb 09 2007

Extensions

a(22)-a(29) from Vincenzo Librandi, Mar 31 2012

Status

approved