OFFSET
1,2
COMMENTS
Next terms are a(14) = 2^206, a(15) = 590295810335799160457^3, a(16) = 2^754. - Max Alekseyev, May 21 2011
Note: if the definition is changed to refer to the perfect powers in A001597, the sequence becomes A137354. -R. J. Mathar, Mar 07 2008
LINKS
Max Alekseyev, Table of n, a(n) for n = 1..16
EXAMPLE
a(2) = 4 because 1 + 3 = 4;
a(3) = 9 because 1 + 3 + 5 = 9;
a(4) = 16 because 1 + 3 + 5 + 7 = 16;
a(5) = 27 because 1 + 3 + 5 + 7 + 11 = 27;
a(6) = 64 because 1 + 3 + 5 + 7 + 11 + 37 = 64;
a(7) = 125 because 1 + 3 + 5 + 7 + 11 + 37 + 61 = 125;
a(8) = 256 because 1 + 3 + 5 + 7 + 11 + 37 + 61 + 131 = 256.
CROSSREFS
KEYWORD
nonn
AUTHOR
Giovanni Teofilatto, Jan 10 2006
EXTENSIONS
3 more terms from R. J. Mathar, Mar 07 2008
a(12) from Donovan Johnson, Aug 09 2010
a(13)-a(16) from Max Alekseyev, May 21 2011
STATUS
approved