This site is supported by donations to The OEIS Foundation.

 Annual Appeal: Please make a donation to keep the OEIS running. In 2018 we replaced the server with a faster one, added 20000 new sequences, and reached 7000 citations (often saying "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A028413 Numbers k such that k^2 + k + 1 is a palindrome. 3
 0, 1, 2, 10, 18, 27, 100, 125, 173, 1000, 1120, 1184, 1355, 1836, 1876, 1961, 10000, 11915, 100000, 119084, 126935, 187876, 188348, 192383, 196813, 1000000, 1010200, 1190915, 1228425, 1780728, 1821636, 1975356, 10000000, 11842184, 12643549, 12783239, 18016058 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Giovanni Resta, Table of n, a(n) for n = 1..68 P. De Geest, Palindromic quasi_over_squares of the form n^2+(n+1) MATHEMATICA palQ[n_] := Block[{d = IntegerDigits[n]}, d == Reverse[d]]; f[n_] := n^2 + n + 1; Select[Range[0, 10^5], palQ@ f@ # &] (* Giovanni Resta, Aug 29 2018 *) CROSSREFS Cf. A002113, A028414, A028336, A027712. Sequence in context: A017089 A097269 A304054 * A282226 A082969 A173592 Adjacent sequences:  A028410 A028411 A028412 * A028414 A028415 A028416 KEYWORD nonn,base AUTHOR 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 13 01:24 EST 2018. Contains 318081 sequences. (Running on oeis4.)