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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A083433 a(1) = 1; a palindrome is included in the sequence if it has a prime signature that is different from all previous terms. 0
1, 2, 4, 6, 8, 44, 66, 88, 252, 272, 414, 484, 616, 858, 2112, 2772, 2992, 4004, 4224, 6006, 6336, 6776, 8008, 8448, 14641, 25952, 27872, 27972, 29592, 29792, 36963, 40404, 42224, 42624, 44544, 44944, 48384, 63336, 63536, 63936, 69696, 84448 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..42.

EXAMPLE

66 = 2*3*11 is the smallest palindrome with prime signature p*q*r;

252 = 2^2*3^2*7 is the smallest palindrome with prime signature p^2*q^2*r;

77 is not a member as 6 which is a member has the same prime signature p*q;

where p,q,r are primes.

CROSSREFS

Cf. A083434, A083435.

Sequence in context: A108425 A215216 A059569 * A083435 A163502 A110995

Adjacent sequences:  A083430 A083431 A083432 * A083434 A083435 A083436

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Apr 29 2003

EXTENSIONS

Corrected and extended by David Wasserman, Nov 03 2004

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 5 22:11 EDT 2020. Contains 336214 sequences. (Running on oeis4.)