A115653 Prime numbers which are the sum of distinct double factorials (A006882).

2, 3, 5, 11, 13, 17, 19, 23, 29, 53, 59, 61, 67, 71, 73, 107, 109, 113, 131, 157, 163, 167, 173, 179, 181, 389, 397, 401, 409, 433, 443, 449, 457, 461, 491, 499, 503, 509, 541, 547, 557, 563, 947, 953, 971, 997, 1009, 1013, 1019, 1021, 1051, 1061, 1063

Offset: 1

Author

Giovanni Resta, Jan 28 2006

Keywords

• nonn

Comments

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

Examples

			947 is prime and 947 = 9!! + 2!!.
		

Crossrefs

Cf. A006882, A115651, A115652, A115654.