1,1

Conjecture: this is a rearrangement of natural numbers.

Comments from Zak Seidov (zakseidov(AT)yahoo.com), Feb 19 2005:

"Changing the seed produces different sequences, some of which merge into each other:

s2=2,1,3,6,4,8,12,9,5,10,15,25,20,24,16,32,48,30,18,36,27,13,7,53

s3=3,1,2,6,4,8,12,9,5,10,15,25,20,24,16,32,48,30,18,36,27,13,7,53

s4=4,1,5,2,3,15,6,9,45,10,20,8,16,12,13,169,26,7,53,106,265,159,18

s5=5,1,2,4,3,15,6,9,45,10,20,8,16,12,13,169,26,7,53,106,265,159,18

s6=6,1,7,2,4,5,25,10,3,9,8,16,12,18,14,20,32,24,27,81,36,15,75,30,40

s7=7,1,2,5,3,6,4,14,21,9,8,10,15,35,20,16,11,17,12,18,13,19,38,76,95

s8=8,1,3,2,7,21,6,4,13,5,10,16,12,9,39,26,14,28,32,64,20,17,51,24,18

s9=9,1,2,3,5,4,6,10,8,12,15,25,20,24,16,32,48,30,18,36,27,13,7,53,106

s10=10,1,11,2,3,9,4,5,15,6,22,8,12,18,7,19,38,95,57,114,24,16,31,17,32

s11=11,1,2,7,3,4,14,6,8,28,12,16,56,21,9,18,24,5,35,10,29,319,22,15,25,20,30

In every case one may ask if the result is a rearrangement of the natural numbers."

The sum of first 7 terms is 36, hence a(8) = 9 is the least divisor of 36 not occurring earlier.

A094339 := proc(nmax) local a, n, sprev, i; a := [2] ; while nops(a) < nmax do sprev := add(i, i=a) ; n := 1 ; while sprev mod n <> 0 or n in a do n := n+1 ; od ; a := [op(a), n] ; od ; RETURN(a) ; end: A094339(100) ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 30 2007

Cf. A094340, A094341.

Sequence in context: A125205 A125206 A133904 this_sequence A120576 A063707 A118287

Adjacent sequences: A094336 A094337 A094338 this_sequence A094340 A094341 A094342

nonn

Amarnath Murthy (amarnath_murthy(AT)yahoo.com), May 17 2004

Corrected and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 30 2007