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 A086208 Prime numbers p with the property that the sequence p-1*2, p-2*3, p-3*4, p-4*5, ..., consists only of primes and a final 1. 0
 3, 7, 13, 43, 73 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Related to the fact that the list 5, 8, 13, 29, 53, 173, 293 gives the only positive discriminants of class number 1 of the form j^2+1. If we allow the first number that we subtract to be greater than 2, the next sequence after 73, 71, 67, 61,... is 2003, 1831, 1657, 1481, 1303, 1123, 941, 757, 571, 383, 193, 1: start with 2003 and subtract 172,174,176, etc., which is an amusing property of 2003. LINKS EXAMPLE For example 73 71 67 61 53 43 31 17 1. If the GRH is true this is the last example. CROSSREFS Sequence in context: A191974 A174241 A289556 * A090968 A020641 A062736 Adjacent sequences:  A086205 A086206 A086207 * A086209 A086210 A086211 KEYWORD nonn,fini,full AUTHOR Maurice Mischler (maurice.mischler(AT)ima.unil.ch), Aug 27 2003 EXTENSIONS Definition corrected by Harvey P. Dale, Jul 25 2015 STATUS approved

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Last modified July 29 22:26 EDT 2021. Contains 346346 sequences. (Running on oeis4.)