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Search: id:A104426
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| A104426 |
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Numbers n such that n, p[n], p[n]+n, p[n]-n and p[n]*n all are 6-less. |
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+0
1
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| 1, 3, 4, 7, 8, 9, 10, 11, 12, 13, 20, 21, 22, 25, 30, 33, 35, 37, 41, 43, 44, 48, 50, 51, 52, 53, 54, 55, 58, 70, 72, 75, 80, 81, 82, 83, 85, 93, 95, 128, 149, 152, 170, 171, 174, 184, 185, 187, 188, 189, 194, 198, 201, 203, 210, 212, 215, 217, 233, 235, 238, 242, 245
(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 343 are such that n, p[n], p[n]+n, p[n]-n and p[n]*n all are 6-less.
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MATHEMATICA
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id[x_]:=IntegerDigits[x]; pr[i_]:=Prime[i]; ra=Range[3000]; A104426=Select[ra, Position[Union[id[ # ], id[pr[ # ]], id[pr[ # ]+# ], id[pr[ # ]-# ], id[pr[ # ]*# ]], 6]=={}&]
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CROSSREFS
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Cf. A104419-A104428.
Sequence in context: A054155 A054058 A056007 this_sequence A097044 A086986 A057811
Adjacent sequences: A104423 A104424 A104425 this_sequence A104427 A104428 A104429
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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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