A075801 Differences between adjacent palindromic nonprime numbers A032350.

3, 2, 2, 1, 13, 11, 11, 11, 11, 11, 11, 11, 12, 10, 20, 20, 10, 31, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 20, 10, 10, 20, 30, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 10, 20, 10, 20, 10, 31

Offset

1,1

Links

Table of n, a(n) for n=1..70.

Example

a(1)=4-1=3, a(5)=22-9=13.

Maple

test := proc(n) local d; d := convert(n, base, 10); return ListTools[Reverse](d)=d and not isprime(n); end; s := []; for n from 1 to 1000 do if test(n) then s := [op(s), n]; end; od; a := [op(2..-1, s)-op(1..-2, s)];

Crossrefs

Cf. A037010, A032350.

Sequence in context: A357104 A098054 A336987 * A243160 A272694 A292370

Adjacent sequences: A075798 A075799 A075800 * A075802 A075803 A075804

Keyword

nonn,base

Author

Jani Melik, Oct 13 2002

Extensions

Edited by Dean Hickerson, Oct 21 2002

Status

approved