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A061118 Let s(n) be the sequence of squares (A000290). Then this sequence is given by s(1), s(2)s(1)s(3), s(4)s(2)s(1)s(3)s(5), ... 1
1, 419, 1641925, 36164192549, 643616419254981, 100643616419254981121, 144100643616419254981121169, 196144100643616419254981121169225, 256196144100643616419254981121169225289 (list; graph; refs; listen; history; text; internal format)
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

Sequence in context: A298699 A187218 A239253 * A097822 A069064 A024410

Adjacent sequences:  A061115 A061116 A061117 * A061119 A061120 A061121

KEYWORD

nonn,base,less

AUTHOR

Amarnath Murthy, Apr 21 2001

EXTENSIONS

More terms from James A. Sellers, Apr 23 2001

STATUS

approved

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Last modified June 20 06:56 EDT 2021. Contains 345157 sequences. (Running on oeis4.)