OFFSET
3,1
COMMENTS
Is it true that there is no term for n = 56? - T. D. Noe, Oct 03 2011
No, the smallest multidigit palindromic centered 56-gonal number is 14075098988989057041 with base 709000780. - Patrick De Geest, Apr 25 2021
LINKS
Patrick De Geest, Palindromic Centered Polygonal Numbers
T. Trotter, Polygonal numbers
EXAMPLE
15151 is the smallest palindromic centered triangular number.
121 is the smallest palindromic centered 40-gonal number.
MATHEMATICA
palin[n_] := Module[{d = IntegerDigits[n]}, d == Reverse[d]]; Table[n = 1; While[num = n*k*(n-1)/2 + 1; num < 10 || ! palin[num], n++]; num, {k, 3, 50}] (* T. D. Noe, Oct 03 2011 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Kausthub Gudipati, Oct 03 2011
STATUS
approved