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A217425
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Numbers of the form 5^r*7^s whose decimal representations are such that each digit 0-9 appears a prime number of times.
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13
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97402668820327149658203125, 81209257154451887573232591061530625, 13375863052949754169544537548117223100875, 4587921027161765680153776379004207523600125, 2478309849684200670569842256516437530517578125
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OFFSET
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1,1
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COMMENTS
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See the formula section for more data, and other sequences in cross-reference for motivation and similar sequences.
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LINKS
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FORMULA
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EXAMPLE
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A217426(1)=13 and A217427(1)=20, so this sequence's first term is 5^13 * 7^20. It has two copies each of the digits 1, 3, 4, 5, 7 and 9; three each of 0's, 6's and 8's; and five 2's.
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CROSSREFS
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Cf. A217854, A217426, A217427, A217404, A217407, A217410, A217413, A217416, A217419, A217422, A217428, A217431.
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KEYWORD
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nonn,base,less
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AUTHOR
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STATUS
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approved
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