A137106 - OEIS

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A137106

Numbers n such that n and the square of n use only the digits 2, 4, 7 and 8.

2, 22, 28, 88, 278, 472, 478, 2878 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Generated with DrScheme` `No further terms up to 20 billion. [From Harvey P. Dale, Dec 15 2011]`
	LINKS	`J. Wellons, Tables of Shared Digits`
	EXAMPLE	`2878^2 = 8282884`
	MATHEMATICA	`oksQ[n_]:=Module[{idn2=Union[IntegerDigits[n^2]]}, And@@Table[MemberQ[{2, 4, 7, 8}, idn2[[i]]], {i, Length[idn2]}]]; Select[FromDigits/@Flatten[ Table[ Tuples[ {2, 4, 7, 8}, n], {n, 9}], 1], oksQ] (* From Harvey P. Dale, Dec 15 2011 *)`
	CROSSREFS	`Sequence in context: A152243 A074160 A137074 * A053962 A111771 A052001` `Adjacent sequences: A137103 A137104 A137105 * A137107 A137108 A137109`
	KEYWORD	`base,nonn`
	AUTHOR	`Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008`

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Last modified February 16 10:53 EST 2012. Contains 205904 sequences.