A068445 Palindromic pseudoprimes (base 2).

101101, 129921, 1837381, 127665878878566721, 1037998220228997301

Offset

1,1

Comments

a(6), if it exists, is greater than 2^64. - Charles R Greathouse IV, Jun 29 2011

Links

Table of n, a(n) for n=1..5.

Patrick De Geest, Palindromic Pseudoprimes (base 2)

Carlos Rivera, Puzzle 170

Example

a(2)= 129921, So the 2nd palindromic pseudoprime(base-2) number is 129921.

Crossrefs

Sequence in context: A210895 A107274 A107276 * A210888 A115828 A168529

Adjacent sequences: A068442 A068443 A068444 * A068446 A068447 A068448

Keyword

hard,more,nice,base,nonn

Author

Shyam Sunder Gupta, Mar 10 2002; extended Oct 20 2002

Status

approved