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Search: id:A137238
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| A137238 |
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Primes which contain the digit 1 or the digit 2. |
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+0
2
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| 2, 11, 13, 17, 19, 23, 29, 31, 41, 61, 71, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 311, 313, 317, 331, 401, 419
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Chris Caldwell, The First 1,000 Prime.
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EXAMPLE
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2 and 11 are primes which contain either the digit 1 or the digit 2.
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MAPLE
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a:=proc(n) local nn: nn:=convert(convert(n, base, 10), set): if isprime(n) = true and 0 < nops(`intersect`({1, 2}, nn)) then n else end if end proc: seq(a(n), n=1..400); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 31 2008
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MATHEMATICA
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Select[Prime[Range[100]], DigitCount[ # ][[1]] + DigitCount[ # ][[2]] > 0 &] - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Mar 16 2008
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CROSSREFS
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Cf. A133765.
Adjacent sequences: A137235 A137236 A137237 this_sequence A137239 A137240 A137241
Sequence in context: A116437 A048867 A113626 this_sequence A048521 A058048 A038915
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KEYWORD
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nonn,base,easy
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AUTHOR
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Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Mar 08 2008
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EXTENSIONS
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Corrected and extended by Stefan Steinerberger (stefan.steinerberger(AT)gmail.com) and Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 16 2008
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