A054259 - OEIS

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A054259

Squares having last digit equal to the sum of the other digits.

729, 1089, 1225, 3025, 3249, 15129, 21025, 21609, 23409, 31329, 205209, 2241009, 14040009, 15000129, 20223009, 23011209, 104101209, 110313009, 1000014129, 1004010012009, 1010031030009, 10004001000120009, 10010003100300009

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..23.

FORMULA

a(n) = A030134(n)^2. - Andrew Howroyd, Aug 13 2024

MATHEMATICA

Select[Range[101*10^6]^2, Length[Union[Total/@TakeDrop[IntegerDigits[#], -1]]] == 1&] (* Harvey P. Dale, Aug 26 2019 *)

CROSSREFS

Cf. A030134.

Sequence in context: A214106 A045791 A088035 * A202455 A046319 A119710

Adjacent sequences: A054256 A054257 A054258 * A054260 A054261 A054262

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Feb 15 2000

EXTENSIONS

Offset changed by Andrew Howroyd, Aug 13 2024

STATUS

approved

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