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

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A140497 a(n) = 2p - number of digits of p^p, where p = n-th prime. 0
 3, 4, 6, 8, 10, 11, 13, 13, 14, 15, 15, 15, 15, 15, 15, 14, 13, 13, 11, 10, 9, 8, 6, 4, 1, -1, -2, -4, -5, -6, -14, -16, -19, -20, -26, -28, -31, -35, -38, -42, -46, -47, -54, -56, -59, -60, -69, -78, -81, -83 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS MAPLE a:=proc(n) local np, npp: np:=ithprime(n): npp:=convert(np^np, base, 10); 2*np-nops(npp) end proc: seq(a(n), n=1..50); # Emeric Deutsch, Aug 10 2008 MATHEMATICA 2#-IntegerLength[#^#]&/@Prime[Range[50]] (* Harvey P. Dale, Nov 01 2011 *) CROSSREFS Cf. A051674. Sequence in context: A088070 A175071 A336822 * A260479 A285344 A342740 Adjacent sequences:  A140494 A140495 A140496 * A140498 A140499 A140500 KEYWORD base,sign AUTHOR Juri-Stepan Gerasimov, Jul 24 2008 EXTENSIONS Corrected and extended by Emeric Deutsch, Aug 10 2008 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 9 08:41 EST 2021. Contains 349627 sequences. (Running on oeis4.)