This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A096818 Exponents n such that 2^n-13 is prime. 13
 4, 5, 9, 13, 17, 57, 105, 137, 3217, 3229, 4233, 6097, 8757, 11457, 12073, 15425, 40117, 45357, 334809 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Except the first term 4, all terms are odd since for even n, 2^n-13 is divisible by 3. LINKS Search for 2^n-13, PRP Top Records EXAMPLE n=5: 32-13=23 is prime. MATHEMATICA Select[Range[4, 20000], PrimeQ[2^#-13]&] (*From Vladimir Joseph Stephan Orlovsky, Feb 27 2011*) CROSSREFS Exponents for primes of 2^n-d form: A000043 (d=1), A050414 (d=3), A059608 (d=5), A059609 (d=7), A059610 (d=9), A096817 (d=11), A096818 (d=13), A059612 (d=15), A059611 (d=17), A096819 (d=19), A096820 (d=21). Cf. A096502 Sequence in context: A006844 A022425 A116045 * A038099 A120740 A000285 Adjacent sequences:  A096815 A096816 A096817 * A096819 A096820 A096821 KEYWORD nonn,more AUTHOR Labos E. (labos(AT)ana.sote.hu), Jul 13 2004 EXTENSIONS a(16) from Max Alekseyev, a(17)-a(18) from Henri Lifchitz, a(19) from Lelio R Paula, added by Max Alekseyev, Feb 09 2012 STATUS approved

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 .