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A067248 Numbers k such that the digits of prime(k) end in k. 5
7, 9551, 303027, 440999, 968819, 5517973, 27737957, 93230839, 46492090901, 426836115943, 732382677641, 4895576080181, 77628540590583, 3475456543097857, 20396537622790811 (list; graph; refs; listen; history; text; internal format)
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 A242773 A333338

Adjacent sequences:  A067245 A067246 A067247 * A067249 A067250 A067251

KEYWORD

base,nonn,changed

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

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Last modified April 13 09:12 EDT 2021. Contains 342935 sequences. (Running on oeis4.)