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A105990
Near-repdigit semiprimes with 9 as repeated digit.
0
299, 699, 799, 899, 939, 949, 959, 979, 989, 993, 995, 998, 5999, 6999, 7999, 9299, 9599, 9799, 9899, 9939, 9959, 9969, 9979, 9989, 9991, 9993, 9995, 9997, 9998, 19999, 29999, 69999, 91999, 92999, 93999, 95999, 99299, 99599, 99899, 99919, 99949
OFFSET
1,1
EXAMPLE
a(2)=699 is a term because 699 is a semiprime and all digits are equal to 9 except one.
CROSSREFS
Sequence in context: A235229 A064908 A341189 * A160484 A271986 A091028
KEYWORD
base,nonn
AUTHOR
Shyam Sunder Gupta, Apr 29 2005
STATUS
approved