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A171943
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To get a(n+1), add to a(n) the product of the two closest digits to the comma printed before a(n); start with a(1)=a(2)=1.
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1
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1, 1, 2, 4, 12, 16, 18, 24, 40, 56, 56, 86, 134, 140, 144, 144, 148, 152, 160, 162, 162, 164, 166, 170, 176, 176, 182, 188, 190, 198, 198, 206, 222, 234, 238, 246, 262, 274, 278, 286, 302, 320, 326, 326, 344, 362, 374, 380, 392, 392, 398, 404
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OFFSET
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1,3
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COMMENTS
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a(n+1) = a(n) + prod(the least significant digit of a(n-1), the most significant digit of a(n)).
Starting with a(57701) all terms = 500040.
Apparently the sequence ends with constant terms for any initial terms a(1),a(2). (End)
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LINKS
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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