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 A075801 Differences between adjacent palindromic nonprime numbers A032350. 0
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS 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: A130195 A071048 A098054 * 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

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Last modified December 11 02:31 EST 2019. Contains 329912 sequences. (Running on oeis4.)