This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A057676 Smallest prime q(n) such that -q(n)+2^p(n) is a prime, where p(n) = n-th prime. 0
 2, 3, 3, 19, 19, 13, 13, 19, 37, 3, 19, 31, 31, 67, 127, 379, 607, 31, 19, 577, 181, 67, 97, 31, 349, 619, 97, 919, 31, 211, 577, 181, 13, 397, 31, 829, 19, 577, 577, 103, 1669, 199, 19, 31, 439, 1021, 601, 1621, 2017, 733, 3, 199, 2113, 619, 1861, 1297, 241, 967 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS EXAMPLE n = 4, p(4) = 11, 2^11 = 2048, p2 = 2048-p1 is satisfied at first with prime p1 = 19 resulting in prime p2 = 2029, so q(4) = 19. n = 31, p(31) = 127, p2 = 2^127-p1 is satisfied first with p1 = 577 and p2 = 170141183460469231731687303715884105151 So q(31) = 577, the 106th prime. CROSSREFS Cf. A057662, A056206, A056208. Sequence in context: A208798 A090522 A114728 * A062168 A296836 A019229 Adjacent sequences:  A057673 A057674 A057675 * A057677 A057678 A057679 KEYWORD nonn AUTHOR Labos Elemer, Oct 19 2000 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 October 13 19:52 EDT 2019. Contains 327981 sequences. (Running on oeis4.)