This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 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 December 15 04:23 EST 2019. Contains 329991 sequences. (Running on oeis4.)