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A285550 Numbers k such that the digits of k^2 are squares. 5
0, 1, 2, 3, 7, 10, 12, 20, 21, 30, 38, 70, 97, 100, 102, 107, 120, 138, 200, 201, 210, 212, 300, 380, 648, 700, 701, 951, 970, 997, 1000, 1002, 1007, 1020, 1049, 1070, 1200, 1380, 1393, 2000, 2001, 2010, 2100, 2120, 3000, 3148, 3153, 3451, 3743, 3747, 3800 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Giovanni Resta, Table of n, a(n) for n = 1..10000 (first 350 terms from Colin Barker)

FORMULA

a(n) = sqrt(A019544(n)). - Alois P. Heinz, Apr 21 2017

PROG

(PARI) maxk=10000; L=List(); for(k=0, maxk, if(setminus(vecsort(digits(k^2), , 8), [0, 1, 4, 9]) == [], listput(L, k))); Vec(L)

CROSSREFS

Cf. A000290, A019544, A046030.

Sequence in context: A102808 A215937 A140512 * A171863 A101956 A273064

Adjacent sequences:  A285547 A285548 A285549 * A285551 A285552 A285553

KEYWORD

nonn,base

AUTHOR

Colin Barker, Apr 21 2017

STATUS

approved

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Last modified December 8 20:37 EST 2021. Contains 349596 sequences. (Running on oeis4.)