Numbers k such that the sum of the first k double factorials (1!! + 2!! + ... + k!!) is prime.

A114995

Numbers k such that the sum of the first k double factorials (1!! + 2!! + ... + k!!) is prime.

Terms

    a(0) =2a(1) =5a(2) =9a(3) =10a(4) =13a(5) =14a(6) =22a(7) =25a(8) =50a(9) =66a(10) =125a(11) =250a(12) =293a(13) =314a(14) =349a(15) =1622a(16) =1642a(17) =2937a(18) =2966a(19) =3841a(20) =4298a(21) =4898a(22) =5270

External references