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A068178
a(1) = 4; for n>1, a(n) is the smallest square > a(n-1) obtained by inserting digits into a(n-1).
3
4, 49, 1849, 18496, 1784896, 177848896, 17778488896, 1777784888896, 177777848888896, 17777778488888896, 1777777784888888896, 177777777848888888896, 17777777778488888888896
OFFSET
1,1
EXAMPLE
a(2)=49 hence a(3) = 1849 the smallest square formed from 49.
CROSSREFS
Cf. A068175, A068176, A068177, A091877 gives square roots.
Sequence in context: A263441 A067717 A067714 * A050630 A080808 A284328
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Feb 25 2002
EXTENSIONS
Corrected and extended by Ray Chandler, Oct 11 2003
STATUS
approved