A067248 Numbers k such that the digits of prime(k) end in k.

7, 9551, 303027, 440999, 968819, 5517973, 27737957, 93230839, 46492090901, 426836115943, 732382677641, 4895576080181, 77628540590583, 3475456543097857, 20396537622790811

Offset

1,1

Comments

There is no further term up to 115000000. - Farideh Firoozbakht, Jan 01 2007

a(13) > pi(10^15). - Donovan Johnson, May 08 2010

Links

Table of n, a(n) for n=1..15.

Example

Prime(968819) = 14968819 which ends in 968819, so 968819 is a term of the sequence.

Mathematica

(* returns true if a ends with b, false otherwise *) f[a_, b_] := Module[{c, d, e, g, h, i, r}, r = False; c = ToString[a]; d = ToString[b]; e = StringLength[c]; g = StringPosition[c, d]; h = Length[g]; If[h > 0, i = g[[h]]; If[i[[2]] == e, r = True]]; r]; Do[If[f[Prime[n], n], Print[n]], {n, 1, 10^6}]

Crossrefs

Corresponding primes are in A046883.

Cf. A046883, A068575, A075902.

Sequence in context: A116631 A212937 A074489 * A152007 A350148 A242773

Adjacent sequences: A067245 A067246 A067247 * A067249 A067250 A067251

Keyword

base,nonn

Author

Joseph L. Pe, Feb 20 2002

Extensions

a(6) from Zak Seidov, Sep 27 2002

a(7)-a(8) from Farideh Firoozbakht, Jan 01 2007

a(9)-a(12) from Donovan Johnson, May 08 2010

a(13)-a(14) from Chai Wah Wu, Apr 05 2021

a(15) from Chai Wah Wu, Apr 07 2021

Status

approved