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Search: id:A104425
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| A104425 |
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Numbers n such that n, p[n], p[n]+n, p[n]-n and p[n]*n all are 5-less. |
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+0
1
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| 1, 4, 6, 7, 9, 10, 11, 18, 19, 23, 27, 29, 30, 32, 40, 41, 42, 43, 44, 49, 60, 61, 63, 67, 69, 70, 73, 74, 79, 80, 110, 111, 131, 140, 143, 144, 166, 170, 171, 179, 180, 181, 183, 184, 187, 189, 193, 196, 199, 200, 201, 202, 206, 209, 223, 228, 229, 233, 261, 263, 270
(list; graph; listen)
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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 369 are such that n, p[n], p[n]+n, p[n]-n and p[n]*n all are 5-less.
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MATHEMATICA
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id[x_]:=IntegerDigits[x]; pr[i_]:=Prime[i]; ra=Range[3000]; A104425=Select[ra, Position[Union[id[ # ], id[pr[ # ]], id[pr[ # ]+# ], id[pr[ # ]-# ], id[pr[ # ]*# ]], 5]=={}&]
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CROSSREFS
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Cf. A104419-A104428.
Sequence in context: A144222 A010414 A095096 this_sequence A080746 A069909 A101993
Adjacent sequences: A104422 A104423 A104424 this_sequence A104426 A104427 A104428
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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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