A109736 Where n appears in A109890.

1, 2, 3, 5, 9, 4, 23, 6, 8, 10, 40, 7, 22, 30, 11, 15, 67, 19, 49, 13, 38, 42, 43, 14, 12, 56, 21, 46, 48, 18, 58, 16, 41, 68, 37, 20, 89, 57, 60, 55, 76, 63, 151, 78, 107, 96, 98, 17, 61, 65, 69, 71, 24, 103, 87, 64, 80, 74, 44, 83, 59, 92, 101, 94, 72, 91, 185, 142, 104, 45

Offset

1,2

Comments

a(10^n): 1, 10, 128, 1430, ... - Robert G. Wilson v, Aug 12 2005

a(n) = A094341(n) for 3 <= n <= 70. - Georg Fischer, Nov 02 2018

Links

Richard J. Mathar and Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 (first 282 terms from Richard J. Mathar)

Mathematica

a[1] = 1; a[2] = 2; a[n_] := a[n] = Block[{t = Table[a[i], {i, n - 1}]}, s = Plus @@ t; d = Divisors[s]; l = Complement[d, t]; If[l != {}, k = First[l], k = s; While[Position[t, k] == {}, k += s]; k]]; t = Table[a[n], {n, 250}]; Table[k = 1; While[ t[[k]] != n, k++ ]; k, {n, 70}] (* Robert G. Wilson v, Aug 12 2005 *)

Prog

(Haskell)
import Data.List (elemIndex); import Data.Maybe (fromJust)
a109736 = (+ 1) . fromJust . (`elemIndex` a109890_list)
-- Reinhard Zumkeller, Jan 01 2015

Crossrefs

Cf. A094341, A095259, A109890.

Sequence in context: A357101 A232562 A064358 * A119628 A021093 A342444

Adjacent sequences: A109733 A109734 A109735 * A109737 A109738 A109739

Keyword

nonn

Author

N. J. A. Sloane and Nadia Heninger, Aug 11 2005

Extensions

More terms from Robert G. Wilson v, Aug 12 2005

Status

approved