A075805 Differences between adjacent palindromic numbers which are products of an even number of distinct primes.

5, 16, 11, 22, 22, 34, 30, 20, 41, 60, 41, 20, 70, 61, 51, 10, 20, 10, 20, 61, 81, 10, 20, 30, 51, 20, 20, 20, 20, 41, 10, 10, 20, 10, 122, 330, 220, 330, 11, 440, 561, 110, 110, 220, 440, 891, 231, 110, 1551, 451, 330, 550, 1122, 110, 220, 552, 100, 300, 400, 100

Offset

1,1

Links

Table of n, a(n) for n=1..60.

Example

a(1)=6-1=5, a(2)=22-6=16.

Maple

test := proc(n) local d; d := convert(n, base, 10); return ListTools[Reverse](d)=d and numtheory[mobius](n)=1; end; s := []; for n from 1 to 11000 do if test(n) then s := [op(s), n]; end; od; a := [op(2..-1, s)-op(1..-2, s)];

Crossrefs

Cf. A037010.

Sequence in context: A332474 A195866 A363342 * A095872 A298586 A217361

Adjacent sequences: A075802 A075803 A075804 * A075806 A075807 A075808

Keyword

nonn,base

Author

Jani Melik, Oct 13 2002

Extensions

Edited by Dean Hickerson, Oct 21 2002

Status

approved