a(n) is the smallest prime p>2 such that there are 2*n or 2*n+1 positive integers m for which the exponents of 2 and p in the prime power factorization of m! are both powers of 2.

A177378

a(n) is the smallest prime p>2 such that there are 2*n or 2*n+1 positive integers m for which the exponents of 2 and p in the prime power factorization of m! are both powers of 2.

Terms

    a(0) =11a(1) =13a(2) =3a(3) =29a(4) =31a(5) =251a(6) =127a(7) =509a(8) =1021a(9) =4091a(10) =4093a(11) =65519a(12) =8191a(13) =131063a(14) =262133a(15) =262139a(16) =131071a(17) =1048571a(18) =524287a(19) =8388593a(20) =4194301a(21) =67108837a(22) =16777213a(23) =67108861a(24) =1073741789a(25) =2147483587a(26) =2147483629a(27) =536870909

External references