A109019 Numbers whose digit reversal is different and has the same number of prime factors (with multiplicity).

13, 15, 17, 26, 31, 37, 39, 49, 51, 58, 62, 71, 73, 79, 85, 93, 94, 97, 107, 113, 115, 117, 122, 123, 126, 129, 143, 147, 149, 155, 157, 158, 159, 165, 167, 169, 177, 178, 179, 183, 185, 187, 199, 203, 205, 221, 225, 226, 244, 246, 265, 270, 285, 286, 289, 290

Offset

1,1

Comments

Ray Chandler has coauthorship credit for this sequence.

Links

Table of n, a(n) for n=1..56.

Eric Weisstein's World of Mathematics, Almost Prime.

Eric Weisstein's World of Mathematics, Emirp.

Eric Weisstein and Jonathan Vos Post, Emirpimes.

Formula

{A006567} U {A097393} U (A109023} U {A109024} U ... U {A109131} U ...

Mathematica

Select[Range@1000, ! PalindromeQ@# && Differences@PrimeOmega@{#, IntegerReverse@#} == {0} &] (* Hans Rudolf Widmer, Jun 03 2022 *)

Crossrefs

Cf. A006567, A097393, A109018, A109023-A109131.

Sequence in context: A350867 A354745 A341329 * A068893 A079829 A096090

Adjacent sequences: A109016 A109017 A109018 * A109020 A109021 A109022

Keyword

nonn,base

Author

Jonathan Vos Post, Jun 16 2005

Extensions

More terms from Stefan Steinerberger, Jun 16 2007

Status

approved