Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 4500 articles have referenced us, often saying "we would not have discovered this result without the OEIS".
Table of n, a(n) for n=1..27.
212 belongs to this sequence because 212 sorted is 122 and the sum of the squares of the digits of 122 = 1^2 + 2^2 + 2^2= 9 and 122 + 9 = 131, a palindrome.
Sequence in context: A252765 A172801 A235680 * A142890 A201183 A103404
Adjacent sequences: A085934 A085935 A085936 * A085938 A085939 A085940
Jason Earls and Amarnath Murthy, Jul 14 2003