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
MATHEMATICA
Sqrt[#]&/@Select[Range[0, 3800]^2, SubsetQ[{0, 1, 4, 9}, IntegerDigits[#]]&] (* Harvey P. Dale, Jun 14 2022 *)
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
KEYWORD
nonn,base
AUTHOR
Colin Barker, Apr 21 2017
STATUS
approved