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Search: id:A104424
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| A104424 |
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Numbers n such that n, p[n], p[n]+n, p[n]-n and p[n]*n all are 4-less. |
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+0
1
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| 1, 2, 3, 5, 6, 8, 10, 22, 23, 26, 27, 28, 29, 31, 39, 57, 58, 62, 66, 112, 120, 122, 125, 126, 129, 130, 131, 135, 137, 139, 152, 153, 178, 182, 183, 192, 196, 210, 211, 212, 213, 216, 220, 221, 222, 250, 280, 285, 286, 287, 291, 293, 295, 299, 300, 303, 305, 306
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OFFSET
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1,2
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COMMENT
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From the first 3000 primes, only 289 are such that n, p[n], p[n]+n, p[n]-n and p[n]*n all are 4-less.
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MATHEMATICA
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id[x_]:=IntegerDigits[x]; pr[i_]:=Prime[i]; ra=Range[3000]; A104424=Select[ra, Position[Union[id[ # ], id[pr[ # ]], id[pr[ # ]+# ], id[pr[ # ]-# ], id[pr[ # ]*# ]], 4]=={}&]
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CROSSREFS
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Cf. A104419-A104428.
Adjacent sequences: A104421 A104422 A104423 this_sequence A104425 A104426 A104427
Sequence in context: A053873 A118053 A124145 this_sequence A028806 A028731 A028740
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KEYWORD
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nonn,base
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Mar 07 2005
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