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A171943
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.
1
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
OFFSET
1,3
COMMENTS
a(n+1) = a(n) + prod(the least significant digit of a(n-1), the most significant digit of a(n)).
From Zak Seidov, Oct 28 2010: (Start)
Starting with a(57701) all terms = 500040.
Apparently the sequence ends with constant terms for any initial terms a(1),a(2). (End)
LINKS
Eric Angelini, Add to a(n) a product of digits [Cached copy, with permission]
CROSSREFS
Sequence in context: A082458 A230770 A224703 * A225748 A358231 A114064
KEYWORD
nonn,base
AUTHOR
Eric Angelini, Sep 25 2010
STATUS
approved