The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A182375 Positive integers n such that n*2^n - 3 is prime. 0
 2, 4, 5, 14, 16, 17, 34, 38, 133, 175, 218, 284, 1036, 1441, 1550, 2893, 2933, 3770 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Similar to the Woodall primes, A050918. The next term in this sequence is unknown; if it is infinite, the next term is greater than 8000. LINKS EXAMPLE 5 = 2*2^2 - 3;  61 = 4*2^4 - 3;  157 = 5*2^5 - 3 MAPLE #choose N large, then S is the desired set f:=n->n*2^n - 3: S:={}: for n from 0 to N do if(isprime(f(n))) then S:=S union {n}: fi: od CROSSREFS Cf. A050918.  Values for primes are A182352. Sequence in context: A174513 A000063 A039574 * A295402 A121410 A002959 Adjacent sequences:  A182372 A182373 A182374 * A182376 A182377 A182378 KEYWORD nonn AUTHOR Patrick Devlin, Apr 26 2012 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 14 16:19 EDT 2021. Contains 345037 sequences. (Running on oeis4.)