A084123 Palindromic numbers which are equal to a number n multiplied by the n-th prime.

2, 6, 55, 444, 848, 122555221, 161131161, 5729689869275, 7587952597857, 35757255275753, 182196497222794691281

Offset

1,1

Comments

a(12) > 4.3*10^26. [Giovanni Resta, Jun 28 2013]

Links

Table of n, a(n) for n=1..11.

Example

The palindrome 161131161 is in the sequence since 39119 is the 4119th prime and 4199*39119 = 161131161.

Mathematica

palQ[n_]:=FromDigits[Reverse[IntegerDigits[n]]]==n; t={}; Do[If[palQ[x=n*Prime[n]], AppendTo[t, x]], {n, 15*10^5}]; t (* Jayanta Basu, May 11 2013 *)

Crossrefs

Cf. A084121, A084122.

Sequence in context: A264610 A153450 A179389 * A193473 A336899 A181509

Adjacent sequences: A084120 A084121 A084122 * A084124 A084125 A084126

Keyword

base,nonn

Author

Giovanni Resta, May 14 2003

Status

approved