OFFSET
1,2
COMMENTS
We may call these numbers the self or Colombian squares. Subsequence of A003052. There are 446 such self squares < 2*10^7, 218 odd and 228 even.
Kaprekar (1963) introduced these numbers and called them self-square numbers. - N. J. A. Sloane, Oct 30 2014
REFERENCES
D. R. Kaprekar, The Mathematics of the New Self Numbers, Privately Printed, 311 Devlali Camp, Devlali, India, 1963.
LINKS
D. R. Kaprekar, The Mathematics of the New Self Numbers [annotated and scanned]
Zak Seidov, Safe squares
MATHEMATICA
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Zak Seidov, Dec 15 2009
EXTENSIONS
Changed the word "safe" in this entry to "self". - N. J. A. Sloane, Feb 26 2017
STATUS
approved