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A020450
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Primes that contain digits 1 and 2 only.
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0
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2, 11, 211, 2111, 2221, 12211, 21121, 21211, 21221, 22111, 111121, 111211, 112111, 112121, 1111211, 1121221, 1212121, 1212221, 1221221, 2121121, 2211211, 2221111, 11221211, 12111221, 12121121, 12121211, 12122111, 12122221, 12212111, 12222121
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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PROG
| (PARI) for(nd=1, 9, forvec(v=vector(nd, i, [49, 50-(i==nd && i>1)]), isprime(t=eval(Strchr(Vecsmall(v)))) && print1(t", "))) [From M. F. Hasler (www.univ-ag.fr/~mhasler), Mar 18 2010]
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CROSSREFS
| Cf. A020449 (digits 0 & 1), ..., A020472 (digits 8 & 9). [From M. F. Hasler (www.univ-ag.fr/~mhasler), Mar 18 2010]
Sequence in context: A051663 A188203 A070256 * A036229 A104337 A042805
Adjacent sequences: A020447 A020448 A020449 * A020451 A020452 A020453
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KEYWORD
| nonn,base
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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