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!)
 A320930 Numbers n such that 4^n starts with n. 0
 10, 17, 556, 1771, 4695, 38537, 56969, 345797, 141419115, 1788191728 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE 4^10 = 1048576 starts with 10, so 10 is in the sequence. MAPLE filter:= proc(n) local t, b;   t:= 4^n; b:= ilog10(t) - ilog10(n); floor(t/10^b) = n end proc: select(filter, [\$1..10^5]); CROSSREFS Cf. A100129, A288845. Sequence in context: A177185 A241281 A002744 * A337325 A156382 A214894 Adjacent sequences:  A320927 A320928 A320929 * A320931 A320932 A320933 KEYWORD nonn,base,more AUTHOR Robert Israel, Oct 24 2018 EXTENSIONS a(8)-a(10) from Giovanni Resta, Oct 25 2018 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 18:53 EDT 2021. Contains 343744 sequences. (Running on oeis4.)