OFFSET
1,2
COMMENTS
Includes all numbers of the form (100^k + 3*10^k + 1)^2 for k >= 2, of the form (100^k + 8*10^k + 1)^2 for k >= 2, and of the form (4*100^k + 127*10^k + 4)^2 for k >= 5. - Andrew Howroyd, Oct 18 2024
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..47
Patrick De Geest, Index to related sequences
Hisanori Mishima, Sporadic tridigital solutions
FORMULA
a(n) = A058417(n)^2. - Andrew Howroyd, Oct 18 2024
CROSSREFS
KEYWORD
nonn,base,changed
AUTHOR
Patrick De Geest, Nov 15 2000
EXTENSIONS
a(15) onwards added using A058417 by Andrew Howroyd, Oct 18 2024
STATUS
approved