OFFSET
1,2
COMMENTS
a(n) is the concatenation of squares about 1 with even squares on the left and the odd squares on the right.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..50
Felice Russo, A Set of New Smarandache Functions, Sequences and Conjectures in Number Theory., Lupton, AZ: American Research Press, 2000.
EXAMPLE
a(3) = 1641925, concatenation of 16, 4, 1, 9 and 25.
MAPLE
for n from 1 to 15 do for k from 2*(n-1) to 2 by -2 do printf(`%d`, k^2) od: for k from 1 to 2*n-1 by 2 do printf(`%d`, k^2) od: printf(`, `): od:
MATHEMATICA
Table[Module[{sqs=Range[n]^2}, FromDigits[Flatten[IntegerDigits/@ Join[ Reverse[ Select[ sqs, EvenQ]], Select[sqs, OddQ]]]]], {n, 1, 21, 2}] (* Harvey P. Dale, Aug 13 2014 *)
CROSSREFS
KEYWORD
nonn,base,less
AUTHOR
Amarnath Murthy, Apr 21 2001
EXTENSIONS
More terms from James A. Sellers, Apr 23 2001
STATUS
approved