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A105990 Near-repdigit semiprimes with 9 as repeated digit. 0

%I #2 Oct 02 2013 15:47:27

%S 299,699,799,899,939,949,959,979,989,993,995,998,5999,6999,7999,9299,

%T 9599,9799,9899,9939,9959,9969,9979,9989,9991,9993,9995,9997,9998,

%U 19999,29999,69999,91999,92999,93999,95999,99299,99599,99899,99919,99949

%N Near-repdigit semiprimes with 9 as repeated digit.

%e a(2)=699 is a term because 699 is a semiprime and all digits are equal to 9 except one.

%K base,nonn

%O 1,1

%A _Shyam Sunder Gupta_, Apr 29 2005

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Last modified April 19 07:38 EDT 2024. Contains 371782 sequences. (Running on oeis4.)