A115652 - OEIS

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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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

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

LINKS

Table of n, a(n) for n=1..45.

EXAMPLE

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

CROSSREFS

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

Sequence in context: A362910 A036326 A078972 * A337372 A317299 A236026

Adjacent sequences: A115649 A115650 A115651 * A115653 A115654 A115655

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Jan 28 2006

STATUS

approved