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URL: https://oeis.org/A037070

⇱ A037070 - OEIS

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A037070
a(n)-th prime is the smallest prime containing exactly n 9's.
10
1, 8, 46, 303, 5133, 17984, 216816, 1270607, 41146179, 420243162, 2524038155, 36159205628, 343392568900, 1955010428258, 15237833654620, 260219446617109, 2621513397605657, 24619309639366177, 233874804775621799, 684559920583084690, 20920441130654929928, 200085344903558463823
OFFSET
0,2
LINKS
Andrew R. Booker, The Nth Prime Page.
Kim Walisch, primecount, Fast prime counting function library.
FORMULA
a(n) = A000720(A037071(n)). - Amiram Eldar, Jul 21 2025
MATHEMATICA
(* see A037071 for f *) PrimePi[ Table[ f[n, 9], {n, 1, 13}]]
KEYWORD
nonn,base,hard
AUTHOR
Patrick De Geest, Jan 04 1999
EXTENSIONS
One more term from Vladeta Jovovic, Jan 10 2002
a(0)=1 prepended by Sean A. Irvine, Dec 06 2020
a(14)-a(21) calculated using Kim Walisch's primecount and added by Amiram Eldar, Jul 21 2025
STATUS
approved