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A031162 Numbers that are both lucky and square. 6
1, 9, 25, 49, 169, 289, 361, 529, 729, 841, 961, 1369, 2209, 3481, 3721, 3969, 4761, 5041, 7921, 9409, 9801, 10609, 12321, 15129, 17689, 20449, 21609, 24025, 24649, 32041, 32761, 35721, 36481, 42025, 42849, 43681, 50625, 52441, 53361 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Donovan Johnson, Table of n, a(n) for n = 1..2512 (terms < 10^9)

MATHEMATICA

lst = Range[1, 73440, 2]; i = 2; While[ i <= (len = Length@lst) && (k = lst[[i]]) <= len, lst = Drop[lst, {k, len, k}]; i++ ]; Select[lst, IntegerQ@ Sqrt@# &] (* Robert G. Wilson v, May 12 2006 *)

CROSSREFS

Cf. A000959, A031163.

Sequence in context: A266132 A112629 A225322 * A147160 A239745 A269440

Adjacent sequences:  A031159 A031160 A031161 * A031163 A031164 A031165

KEYWORD

nonn

AUTHOR

Patrick De Geest

STATUS

approved

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Last modified January 19 19:49 EST 2019. Contains 319309 sequences. (Running on oeis4.)