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A115665
Brilliant numbers (A078972) whose digit reversal is a semiprime (A001358).
1
4, 6, 9, 15, 49, 121, 143, 169, 187, 221, 289, 319, 323, 341, 437, 493, 533, 551, 559, 589, 629, 667, 737, 767, 781, 817, 851, 871, 893, 899, 913, 923, 949, 961, 979, 989, 1027, 1067, 1079, 1121, 1219, 1247, 1273, 1343, 1357, 1387, 1411, 1513, 1577
OFFSET
1,1
EXAMPLE
551=19*29 is brilliant and 155=5*31 is semiprime.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Jan 31 2006
STATUS
approved