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A046834 Internal digits of n^2 include digits of n as subsequence. 1
50, 60, 250, 500, 600, 760, 1050, 2050, 2500, 3050, 3628, 3710, 3760, 3792, 4050, 4410, 5000, 5010, 5050, 5060, 5250, 6000, 6010, 6050, 6250, 6760, 7050, 7560, 7600, 8050, 8250, 8260, 8882, 9050, 9460, 10050, 10500, 14650, 14651, 20050, 20500 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

If n is a member then so is 10*n. - Robert Israel, May 07 2020

LINKS

David A. Corneth, Table of n, a(n) for n = 1..10000 (first 5000 terms from Robert Israel)

EXAMPLE

a(7) = 1050 is a term because 1050^2 = 1102500; remove the first and last to get internal digits 10250, and 1050 is a subsequence of 10250. - Robert Israel, May 07 2020

MAPLE

filter:= n -> StringTools:-IsSubSequence(sprintf("%d", n), sprintf("%d", n^2)[2..-2]):

select(filter, [$10..30000]); # Robert Israel, May 07 2020

CROSSREFS

Cf. A052212.

Sequence in context: A282112 A172468 A046832 * A046836 A062118 A167329

Adjacent sequences:  A046831 A046832 A046833 * A046835 A046836 A046837

KEYWORD

nonn,base,easy

AUTHOR

David W. Wilson

STATUS

approved

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Last modified July 23 17:41 EDT 2021. Contains 346259 sequences. (Running on oeis4.)