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URL: https://oeis.org/A037060

⇱ A037060 - OEIS

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A037060
a(n)-th prime is the smallest prime containing exactly n 4's.
9
1, 13, 86, 603, 4620, 37299, 1533327, 22568442, 23574105, 210014510, 1893613727, 17241353173, 493582559244, 13474975578701, 71056054875827, 1180956491651370, 10728352138939963, 103710009988272649, 960912626678471376, 1005142876338508545, 50686811139876408310, 288867303325879381560
OFFSET
0,2
LINKS
Andrew R. Booker, The Nth Prime Page.
Kim Walisch, primecount, Fast prime counting function library.
FORMULA
a(n) = A000720(A037061(n)). - Amiram Eldar, Jul 20 2025
MATHEMATICA
(* see A037061 for f *) PrimePi[ Table[ f[n, 4], {n, 1, 12}]]
KEYWORD
nonn,base,hard
AUTHOR
Patrick De Geest, Jan 04 1999
EXTENSIONS
a(0)=1 prepended by Sean A. Irvine, Dec 06 2020
a(13)-a(21) calculated using Kim Walisch's primecount and added by Amiram Eldar, Jul 20 2025
STATUS
approved