The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A046395 Palindromes with exactly 5 distinct prime factors. 2
 6006, 8778, 20202, 28182, 41514, 43134, 50505, 68586, 87978, 111111, 141141, 168861, 202202, 204402, 209902, 246642, 249942, 262262, 266662, 303303, 323323, 393393, 399993, 438834, 454454, 505505, 507705, 515515, 516615, 519915, 534435, 535535, 543345 (list; graph; refs; listen; history; text; internal format)
 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 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 Cf. A046331. Sequence in context: A250514 A343432 A115429 * A143043 A031605 A239176 Adjacent sequences:  A046392 A046393 A046394 * A046396 A046397 A046398 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 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 5 22:41 EDT 2021. Contains 346488 sequences. (Running on oeis4.)