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A075801 Differences between adjacent palindromic nonprime numbers A032350. 0

%I

%S 3,2,2,1,13,11,11,11,11,11,11,11,12,10,20,20,10,31,10,10,10,10,10,10,

%T 10,10,10,11,20,10,10,20,30,11,10,10,10,10,10,10,10,10,10,11,10,10,10,

%U 10,10,10,10,10,10,11,10,10,10,10,10,10,10,10,10,11,10,20,10,20,10,31

%N Differences between adjacent palindromic nonprime numbers A032350.

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

%p 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)];

%Y Cf. A037010, A032350.

%K nonn,base

%O 1,1

%A _Jani Melik_, Oct 13 2002

%E Edited by _Dean Hickerson_, Oct 21 2002

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Last modified January 23 10:50 EST 2020. Contains 331171 sequences. (Running on oeis4.)