|
|
A066553
|
|
Let N = 1357911131517192123252729313335373941434547495153555759616365676971..., the concatenation of the odd numbers. a(n) is the n-digit number formed from the digits of N starting from the {n(n-1)/2 +1}th digit. Omit any leading zeros.
|
|
5
|
|
|
1, 35, 791, 1131, 51719, 212325, 2729313, 33537394, 143454749, 5153555759, 61636567697, 173757779818, 3858789919395, 97991011031051, 71091111131151, 1711912112312512, 71291311331351371, 391411431451471491
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
LINKS
|
|
|
MATHEMATICA
|
With[{nn=20}, FromDigits/@TakeList[Flatten[IntegerDigits/@Range[1, (nn (nn+1)), 2]], Range[nn]]] (* Requires Mathematica version 11 or later *) (* Harvey P. Dale, Sep 23 2019 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|