login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A108221 Primes of the form ceiling(sqrt(prime(n))). 1
2, 2, 3, 3, 5, 5, 5, 7, 7, 7, 7, 11, 11, 11, 11, 11, 13, 13, 13, 13, 13, 17, 17, 17, 17, 17, 17, 17, 19, 19, 19, 19, 19, 19, 23, 23, 23, 23, 23, 23, 23, 29, 29, 29, 29, 29, 29, 29, 29, 29, 31, 31, 31, 31, 31, 31, 31, 31, 37, 37, 37, 37, 37, 37, 37, 37, 37, 41, 41, 41, 41, 41, 41 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

FORMULA

a(n) = ceiling(sqrt(A108222(n))).

MATHEMATICA

Ceiling /@ Sqrt /@ Select[Prime /@ Range[300], PrimeQ[Ceiling[Sqrt[ # ]]] &] (*Chandler*)

CROSSREFS

Sequence in context: A057872 A059974 A045767 * A169682 A082524 A099961

Adjacent sequences:  A108218 A108219 A108220 * A108222 A108223 A108224

KEYWORD

easy,nonn

AUTHOR

Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Jun 16 2005

EXTENSIONS

Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jul 03 2005

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 16 01:56 EST 2012. Contains 205860 sequences.