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A184867 Numbers m such that prime(m) is of the form floor(1/2+k*sqrt(2)).  Complement of A184870. 4
2, 4, 5, 6, 7, 9, 11, 12, 13, 15, 17, 18, 20, 22, 23, 24, 27, 28, 29, 30, 31, 33, 34, 36, 37, 38, 39, 40, 42, 43, 45, 46, 47, 48, 50, 51, 52, 55, 56, 57, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 83, 84, 86, 88, 89, 91, 92, 94, 95, 96, 97, 99, 101, 102, 103, 104, 105, 106, 107, 108, 110, 111, 113, 114, 115, 116, 117, 119, 120, 122, 123, 124, 126, 127, 129, 130, 133, 134, 135, 136, 140, 143, 144, 145, 146 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..10000

MATHEMATICA

r=2^(1/2); h=1/2; a[n_]:=Floor[n*r+h];

Table[a[n], {n, 1, 120}] (* A022846, int. nearest 2^(1/2) *)

t1={}; Do[If[PrimeQ[a[n]], AppendTo[t1, a[n]]], {n, 1, 600}]; t1

t2={}; Do[If[PrimeQ[a[n]], AppendTo[t2, n]], {n, 1, 600}]; t2

t3={}; Do[If[MemberQ[t1, Prime[n]], AppendTo[t3, n]], {n, 1, 300}]; t3

(* Lists t1, t2, t3 match A184865, A184866, A184867. *)

CROSSREFS

Cf. A022846, A184865, A184866, A184870.

Sequence in context: A255165 A047316 A099593 * A029903 A242871 A026420

Adjacent sequences:  A184864 A184865 A184866 * A184868 A184869 A184870

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 23 2011

STATUS

approved

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Last modified April 21 17:29 EDT 2021. Contains 343156 sequences. (Running on oeis4.)