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Search: id:A125435
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| A125435 |
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Number of base 23 circular n-digit numbers with adjacent digits differing by 7 or less. |
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+0
1
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| 1, 23, 289, 3047, 37137, 462163, 5880121, 75773539, 985257889, 12888815603, 169303842569, 2230130203467, 29431207313841, 388895110406371, 5143074692086361, 68054649404120347, 900857522223771201
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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[Empirical] a(base,n)=a(base-1,n)+F(7) for base>=7.int(n/2)+1 and F(d) is the largest coefficient in (1+x+...+x^(2d))^n
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PROGRAM
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(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>7)+($[(i+1)mod N]`-$[i]`>7))
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CROSSREFS
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Sequence in context: A142027 A010975 A022588 this_sequence A086943 A131273 A023021
Adjacent sequences: A125432 A125433 A125434 this_sequence A125436 A125437 A125438
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhhardin(AT)att.net), Dec 28 2006
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