已知an=3n+1将an按以下规律放置 a1 a2a3 a4a5a6 a7a8a9a10 .................. 问1:第n行第四个数字是多

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a1a2a3a4a5a6a7a8a9a10a11a12a13a14a15a16a17a18a19a20a21a22a23a24a25a26a27a28a29a30a31a32a33a34a35a36a37a38a39a40a41a42a43a44a45a46a47a48a49a50a51a52a53a54a55a56a57a58a59a60a61a62a63a64a65a66a67a68a69a70a71a72a73a74a75a76a77a78a79a80a81a82a83a84a85a86a87a88a89a90a91a92a93a94a95a96a97a98a99a100...
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