A187098 A permutation of the natural numbers related to Goldbach conjecture.

1, 2, 3, 4, 5, 6, 7, 9, 8, 11, 10, 13, 14, 12, 15, 17, 18, 16, 19, 21, 20, 23, 24, 25, 22, 27, 26, 29, 30, 28, 31, 33, 32, 35, 36, 39, 38, 42, 37, 34, 40, 43, 45, 41, 44, 48, 49, 46, 51, 47, 50, 53, 56, 57, 52, 55, 54, 60, 58, 63, 59, 65, 62, 66, 61, 70, 67, 69, 68, 71, 72, 73, 75, 74, 77, 78, 76, 81, 80, 84

Offset

1,2

Comments

a(n) = if n <= 2 then n else A187085(n-2)/2;

for n > 2: a(n+1) = a(n) + (A187072(n) - A187072(n-2)) / 2.

Links

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

Index entries for sequences that are permutations of the natural numbers

Index entries for sequences related to Goldbach conjecture

Prog

(Haskell)
a187098 n = a187098_list !! (n-1)
a187098_list = 1 : 2 : map (`div` 2) a187085_list

Crossrefs

Cf. A065306, A187099 (inverse).

Cf. A187085, A187072.

Sequence in context: A284120 A183081 A140595 * A187099 A284049 A063932

Adjacent sequences: A187095 A187096 A187097 * A187099 A187100 A187101

Keyword

nonn

Author

Reinhard Zumkeller, Mar 04 2011

Status

approved