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 A190197 a(1) = 2. For n > 1, a(n) is the least prime > a(n-1)*n/2. 0
 2, 3, 5, 11, 29, 89, 313, 1259, 5669, 28349, 155921, 935531, 6080957, 42566731, 319250501, 2554004029, 21709034261, 195381308371, 1856122429537, 18561224295377, 194892855101467, 2143821406116139, 24653946170335607, 295847354044027363, 3698091925550342059, 48075195032154446803 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS MATHEMATICA nxt[{n_, a_}]:={n+1, NextPrime[a (n+1)/2]}; NestList[nxt, {1, 2}, 30][[All, 2]] (* Harvey P. Dale, Feb 05 2020 *) PROG (PARI) lista(nn) = {my(a=2); print1(a, ", "); for (n=2, nn, if (a*n % 2, a = nextprime(a*n/2), a = nextprime(a*n/2+1)); print1(a, ", "); ); } \\ Michel Marcus, Sep 15 2019 CROSSREFS Sequence in context: A047934 A090235 A265418 * A173631 A182987 A334814 Adjacent sequences:  A190194 A190195 A190196 * A190198 A190199 A190200 KEYWORD nonn AUTHOR Pierre CAMI, May 08 2011 EXTENSIONS More terms from Michel Marcus, Sep 15 2019 Name edited by Felix FrÃ¶hlich, Sep 15 2019 STATUS approved

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Last modified June 14 10:04 EDT 2021. Contains 345025 sequences. (Running on oeis4.)