A115652 Brilliant numbers (A078972) which are the sum of distinct double factorials (A006882).

4, 6, 9, 10, 14, 15, 21, 25, 49, 121, 169, 403, 407, 437, 451, 493, 517, 551, 949, 961, 1003, 1007, 1067, 1073, 1079, 1121, 1333, 1343, 1349, 1357, 1387, 1403, 1457, 1501, 3869, 3901, 3953, 4331, 4891, 5183, 5293, 10403, 10807, 11413, 11449

Offset: 1

Author

Giovanni Resta, Jan 28 2006

Keywords

• nonn
• base

Comments

Double factorials 0!! and 1!! are not considered distinct. Note that double factorial (n!!) is different from (n!)!.

Examples

			949 = 13*73 = 9!! + 3!! + 1!!.
		

Crossrefs

Cf. A006882, A078972, A115651, A115653, A115654.