A083749 Brilliant star numbers: semiprimes of the form 6n^2 - 6n + 1 such that both prime factors have the same number of decimal digits.

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

Links

Table of n, a(n) for n=1..31.

Crossrefs

Intersection of A003154 and A078972, or of A218172 and A078972.

Cf. A063773.

Sequence in context: A045571 A088285 A218172 * A211468 A023696 A038467

Adjacent sequences: A083746 A083747 A083748 * A083750 A083751 A083752

Keyword

base,nonn

Author

Jason Earls, Jun 17 2003

Extensions

Definition clarified by Charles R Greathouse IV, Nov 01 2012

Status

approved