A028414 Palindromes of form k^2 + k + 1.
1, 3, 7, 111, 343, 757, 10101, 15751, 30103, 1001001, 1255521, 1403041, 1837381, 3372733, 3521253, 3847483, 100010001, 141979141, 10000100001, 14181118141, 16112621161, 35297579253, 35475157453, 37011411073, 38735553783, 1000001000001, 1020505050201
Offset: 1
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)
Programs
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Mathematica
palQ[n_] := Block[{d = IntegerDigits[n]}, d == Reverse[d]]; f[n_] := n^2 + n + 1; Select[f@ Range[0, 10^5], palQ] (* Giovanni Resta, Aug 29 2018 *)
Extensions
More terms from Giovanni Resta, Aug 28 2018