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A045715 Primes with first digit 9. 21

%I #20 Sep 08 2022 08:44:56

%S 97,907,911,919,929,937,941,947,953,967,971,977,983,991,997,9001,9007,

%T 9011,9013,9029,9041,9043,9049,9059,9067,9091,9103,9109,9127,9133,

%U 9137,9151,9157,9161,9173,9181,9187,9199,9203,9209,9221,9227,9239,9241,9257

%N Primes with first digit 9.

%H Vincenzo Librandi, <a href="/A045715/b045715.txt">Table of n, a(n) for n = 1..1000</a>

%t Flatten[Table[Prime[Range[PrimePi[9 * 10^n] + 1, PrimePi[10^(n + 1)]]], {n, 3}]] (* _Alonso del Arte_, Jul 19 2014 *)

%o (Magma) [p: p in PrimesUpTo(10^4) | Intseq(p)[#Intseq(p)] eq 9]; // _Bruno Berselli_, Jul 19 2014

%o (Magma) [p: p in PrimesInInterval(9*10^n,10^(n+1)), n in [0..3]]; // _Bruno Berselli_, Aug 08 2014

%Y For primes with initial digit d (1 <= d <= 9) see A045707, A045708, A045709, A045710, A045711, A045712, A045713, A045714, A045715; A073517, A073516, A073515, A073514, A073513, A073512, A073511, A073510, A073509

%Y Column k=9 of A262369.

%K nonn,base,easy

%O 1,1

%A _Felice Russo_

%E More terms from _Erich Friedman_.

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Last modified April 23 20:33 EDT 2024. Contains 371916 sequences. (Running on oeis4.)