The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A186191 First digit of tetranacci numbers A000288. 1
 1, 1, 1, 1, 4, 7, 1, 2, 4, 9, 1, 3, 6, 1, 2, 4, 9, 1, 3, 6, 1, 2, 4, 9, 1, 3, 6, 1, 2, 4, 9, 1, 3, 6, 1, 2, 4, 8, 1, 3, 6, 1, 2, 4, 8, 1, 3, 6, 1, 2, 4, 8, 1, 3, 6, 1, 2, 4, 8, 1, 3, 6, 1, 2, 4, 8, 1, 3, 6, 1, 2, 4, 8, 1, 3, 6, 1, 2, 4, 8, 1, 3, 6, 1, 2, 4, 8, 1, 3, 5, 1, 2, 4, 8, 1, 3, 5, 1, 2, 4, 8, 1, 3, 5 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS Sequence obeys Benford law about distribution of first digits in a sequence: P(n)=Log(1+1/n). LINKS EXAMPLE a(10)=9 since Tetra(10)=94. MATHEMATICA t = {1, 1, 1, 1}; Do[AppendTo[t, t[[-1]] + t[[-2]] + t[[-3]] + t[[-4]]], {100}]; Table[IntegerDigits[i][[1]], {i, t}] CROSSREFS Cf. A000288. Sequence in context: A188735 A254338 A197723 * A256507 A123734 A011519 Adjacent sequences:  A186188 A186189 A186190 * A186192 A186193 A186194 KEYWORD nonn,base AUTHOR Carmine Suriano, Feb 14 2011 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 9 15:34 EDT 2021. Contains 343742 sequences. (Running on oeis4.)