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A075805 Differences between adjacent palindromic numbers which are products of an even number of distinct primes. 0
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 (list; graph; refs; listen; history; text; internal format)
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: A195869 A101752 A195866 * 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

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Last modified December 14 07:03 EST 2019. Contains 329978 sequences. (Running on oeis4.)