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A083749
Brilliant star numbers: semiprimes of the form 6n^2 - 6n + 1 such that both prime factors have the same number of decimal digits.
1
121, 253, 793, 1261, 1633, 2773, 3901, 11881, 19153, 24961, 49141, 50233, 59401, 90037, 128773, 162361, 186913, 197653, 268393, 294373, 422941, 492493, 1425937, 1515037, 1663213, 1811701, 2092141, 2185273, 2601733, 3020341, 3063061
OFFSET
1,1
COMMENTS
Brilliant numbers are A078972; "star numbers" here refers to centered 12-gonal numbers A003154, but there exist other definitions for this name. - M. F. Hasler, Nov 01 2012
CROSSREFS
Intersection of A003154 and A078972, or of A218172 and A078972.
Cf. A063773.
Sequence in context: A045571 A088285 A218172 * A211468 A023696 A038467
KEYWORD
base,nonn
AUTHOR
Jason Earls, Jun 17 2003
EXTENSIONS
Definition clarified by Charles R Greathouse IV, Nov 01 2012
STATUS
approved