login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Comma transform of the odd numbers.
1

%I #14 Jan 16 2024 16:17:05

%S 13,35,57,79,91,11,31,51,71,92,12,32,52,72,93,13,33,53,73,94,14,34,54,

%T 74,95,15,35,55,75,96,16,36,56,76,97,17,37,57,77,98,18,38,58,78,99,19,

%U 39,59,79,91,11,31,51,71,91,11,31,51,71,91,11,31,51,71,91,11,31,51,71,91,11,31,51,71,91,11,31,51,71,91

%N Comma transform of the odd numbers.

%C See A367360 for further information.

%H Alois P. Heinz, <a href="/A368361/b368361.txt">Table of n, a(n) for n = 0..10000</a>

%p a:= n-> parse(cat(""||(2*n+1)[-1], ""||(2*n+3)[1])):

%p seq(a(n), n=0..79); # _Alois P. Heinz_, Jan 03 2024

%o (Python)

%o def A368361(n): return (10,30,50,70,90)[n%5]+int(str((n<<1)+3)[0]) # _Chai Wah Wu_, Jan 03 2024

%Y Cf. A005408, A367360.

%K nonn,base

%O 0,1

%A _N. J. A. Sloane_, Jan 02 2024