A072299 Reverse(k) is a prime factor of k.

2, 3, 5, 7, 11, 20, 30, 50, 70, 101, 110, 131, 151, 181, 191, 200, 300, 313, 353, 373, 383, 500, 700, 727, 757, 787, 797, 919, 929, 1010, 1100, 1310, 1510, 1810, 1910, 2000, 3000, 3130, 3530, 3730, 3830, 5000, 7000, 7270, 7570, 7870, 7970, 9190, 9290

Offset

0,1

Comments

All palindromic primes are terms of this sequence. - Harvey P. Dale, Jun 30 2022

Links

Harvey P. Dale, Table of n, a(n) for n = 0..699 (all terms up to 5 million)

Example

Reverse(110) = 11 is a prime factor of 110, so 110 is a term of the sequence.

Mathematica

r = {}; Do[m = FromDigits[Reverse[IntegerDigits[n]]]; If[PrimeQ[m] && Mod[n, m] == 0, r = Append[r, n]], {n, 1, 10^4}]; r
Select[Range[2, 10000], MemberQ[FactorInteger[#][[All, 1]], IntegerReverse[#]]&] (* Harvey P. Dale, Jun 30 2022 *)

Crossrefs

Sequence in context: A373045 A079429 A262378 * A334199 A297026 A038204

Adjacent sequences: A072296 A072297 A072298 * A072300 A072301 A072302

Keyword

base,nonn

Author

Joseph L. Pe, Jul 14 2002

Status

approved