OFFSET
0,1
COMMENTS
The sequence of absolute differences is 1,2,6,4,22,8,66,44.... Conjecture: this sequence is infinite and contains every even palindrome.
EXAMPLE
a(3) = 11: |11-5| = 6, a palindrome. The primes < 5 are excluded because they have already occurred in the sequence. 7 is excluded because |7-5| = 2 has already occurred as a difference.
CROSSREFS
KEYWORD
base,nonn,easy
AUTHOR
Amarnath Murthy, Sep 17 2003
EXTENSIONS
Edited and extended by David Wasserman, Jun 14 2005
STATUS
approved