The OEIS is supported by the many generous donors to the OEIS Foundation.

 Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A207973 Primes p such that the equation prime(p-k)+k! = prime(p) has at least one solution k>0. 0
 2, 31, 43, 67, 107, 151, 167, 179, 227, 233, 389, 509, 547, 661, 719, 769, 823, 829, 967, 1033, 1093, 1259, 1321, 1493, 1567, 1733, 1873, 2099, 2341, 2539, 2621, 2683, 2819, 2927, 3119, 3169, 3373 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Apart from the first entry, the majority of the entries stem from k=4, i.e., this is essentially a reverse lookup within A033560. - R. J. Mathar, Mar 15 2012 LINKS EXAMPLE 2 is in the sequence because prime(2) = prime(2-1)+1 = 3, 31 is in the sequence because prime(31) = prime(31-4)+1*2*3*4 = 103+24 = 127, 43 is in the sequence because prime(43) = prime(43-4)+1*2*3*4 = 167+24 = 191. PROG (PARI) is_A207973(n)={local(k); k=1; while((k

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

Last modified December 5 15:27 EST 2022. Contains 358588 sequences. (Running on oeis4.)