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A106100 Primes with maximal digit = 2. 8

%I #12 Jan 02 2019 07:23:39

%S 2,211,1021,1201,2011,2111,2221,10211,12011,12101,12211,20011,20021,

%T 20101,20201,21001,21011,21101,21121,21211,21221,22111,101021,101221,

%U 102001,102101,102121,110221,111121,111211,112111,112121,120011,120121

%N Primes with maximal digit = 2.

%C Subsequence of A036953. Prime numbers p such that A209928(p) = 2. Complement of A221698 with respect to A221697. [_Jaroslav Krizek_, Jan 22 2013]

%H Robert Israel, <a href="/A106100/b106100.txt">Table of n, a(n) for n = 1..10000</a>

%p N:= 6: # to get all terms of up to N digits

%p M2:= {1};M1:= {1}:

%p for d from 1 to N-1 do

%p M2:= map(t -> (t, t+10^d, t+2*10^d), M2);

%p M1:= map(t -> (t, t+10^d), M1);

%p od:

%p sort(convert({2} union select(isprime,M2 minus M1),list)); # _Robert Israel_, Jun 19 2016

%t Select[Prime[Range[10000]], Max[IntegerDigits[ # ]]==2&]

%o (PARI) isok(p) = isprime(p) && (vecmax(digits(p)) == 2); \\ _Michel Marcus_, Jan 02 2019

%Y Cf. A106093, A106094, A106095, A106096, A106097, A106098, A106099.

%K nonn,base

%O 1,1

%A _Zak Seidov_, May 07 2005

%E More terms from _Rick L. Shepherd_, May 22 2005

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Last modified April 16 01:01 EDT 2024. Contains 371696 sequences. (Running on oeis4.)