The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A027719 Numbers k such that k^2 + 1 is a palindrome. 5
 0, 1, 2, 10, 25, 100, 1000, 1020, 1489, 2248, 10000, 10090, 100000, 100910, 102020, 167491, 1000000, 1000200, 1009090, 2744934, 10000000, 10000900, 10090910, 24917195, 100000000, 100909090, 103226660, 271867456, 1000000000, 1000002000, 1009090910, 1577033471 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Giovanni Resta, Table of n, a(n) for n = 1..48 P. De Geest, Palindromic incremented squares of the form n^2+1 MATHEMATICA palQ[n_] := Block[{d = IntegerDigits[n]}, d == Reverse[d]]; Select[Range[0, 10^5], palQ[#^2 + 1] &] (* Giovanni Resta, Aug 29 2018 *) CROSSREFS Cf. A002522, A027720, A002778, A070253. Sequence in context: A305600 A058373 A167386 * A254709 A069894 A045605 Adjacent sequences: A027716 A027717 A027718 * A027720 A027721 A027722 KEYWORD nonn,base AUTHOR Patrick De Geest EXTENSIONS More terms from Giovanni Resta, Aug 28 2018 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified September 24 12:42 EDT 2023. Contains 365579 sequences. (Running on oeis4.)