login

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

Concatenation of (5n-4), (5n-3), (5n-2), (5n-1) and 5n divided by 5.
5

%I #5 Nov 09 2019 12:48:01

%S 2469,135782,222426283,323436384,424446485,525456586,626466687,

%T 727476788,828486889,929496990,1030507091,1131517192,1232527293,

%U 1333537394,1434547495,1535557596,1636567697,1737577798,1838587899,19395979820,20220420620821,21221421621822

%N Concatenation of (5n-4), (5n-3), (5n-2), (5n-1) and 5n divided by 5.

%H Andrew Howroyd, <a href="/A082253/b082253.txt">Table of n, a(n) for n = 1..1000</a>

%e a(3) = 1112131415/5 = 222426283.

%o (PARI) a(n)={fromdigits(concat(vector(5, k, digits(5*(n-1)+k))))/5} \\ _Andrew Howroyd_, Nov 09 2019

%Y Cf. A082251, A082252, A082254, A082255, A082256.

%K base,easy,nonn

%O 1,1

%A _Amarnath Murthy_, Apr 11 2003

%E Terms a(12) and beyond from _Andrew Howroyd_, Nov 09 2019