OFFSET
1,1
COMMENTS
No exponent of the distinct prime factors can be greater than one, i.e., no prime powers are permitted. - Harvey P. Dale, Apr 09 2021 at the suggestion of Sean A. Irvine
See A373465 for the similar sequence where only distinct prime divisors are counted, but may occur to higher powers. - M. F. Hasler, Jun 06 2024
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..500
EXAMPLE
505505 = 5 * 7 * 11 * 13 * 101.
MATHEMATICA
Select[Range[550000], PalindromeQ[#]&&PrimeNu[#]==PrimeOmega[#]==5&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Apr 09 2021 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Jun 15 1998
EXTENSIONS
Corrected at the suggestion of Sean A. Irvine by Harvey P. Dale, Apr 09 2021
Name edited to avoid confusion by M. F. Hasler, Jun 06 2024
STATUS
approved