login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A106100 Primes with maximal digit = 2. 4
2, 211, 1021, 1201, 2011, 2111, 2221, 10211, 12011, 12101, 12211, 20011, 20021, 20101, 20201, 21001, 21011, 21101, 21121, 21211, 21221, 22111, 101021, 101221, 102001, 102101, 102121, 110221, 111121, 111211, 112111, 112121, 120011, 120121 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Subsequence of A036953. Prime numbers p such that A209928(p) = 2. Complement of A221698 with respect to A221697.[From Jaroslav Krizek, Jan 22 2013]

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

MAPLE

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

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

for d from 1 to N-1 do

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

  M1:= map(t -> (t, t+10^d), M1);

od:

sort(convert({2} union select(isprime, M2 minus M1), list)); # Robert Israel, Jun 19 2016

MATHEMATICA

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

CROSSREFS

Sequence in context: A050445 A167833 A167838 * A167839 A107612 A068814

Adjacent sequences:  A106097 A106098 A106099 * A106101 A106102 A106103

KEYWORD

nonn,base

AUTHOR

Zak Seidov, May 07 2005

EXTENSIONS

More terms from Rick L. Shepherd, May 22 2005

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified August 25 00:27 EDT 2016. Contains 275784 sequences.