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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A114964 a(n) = n^2 + 30. 6
30, 31, 34, 39, 46, 55, 66, 79, 94, 111, 130, 151, 174, 199, 226, 255, 286, 319, 354, 391, 430, 471, 514, 559, 606, 655, 706, 759, 814, 871, 930, 991, 1054, 1119, 1186, 1255, 1326, 1399, 1474, 1551, 1630, 1711, 1794, 1879, 1966, 2055, 2146, 2239, 2334, 2431 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

x^2 + 30 != y^n for all x,y and n > 1, so this is a subsequence of A007916.

From Bruno Berselli, May 12 2014: (Start)

This is the case k=5 of the identity n^2 + k*(k+1) = ( Sum_{i=-k..k} (n+i)^3 ) / ( (2*k+1)*n ). Similar sequences:

k=1, A059100;

k=2, A114949;

k=3, A241748;

k=4, A241850. (End)

The old name of this sequence was: Numbers of the form x^2 + 30. Also numbers that are not a perfect power.

LINKS

Shawn A. Broyles, Table of n, a(n) for n = 0..1000

J. H. E. Cohn, The diophantine equation x^2 + C = y^n, Acta Arithmetica LXV.4 (1993).

Index entries for linear recurrences with constant coefficients, signature (3,-3,1).

FORMULA

11*4*a(4) = (-1)^3 + 0^3 + 1^3 + 2^3 + 3^3 + 4^3 + 5^3 + 6^3 + 7^3 + 8^3 + 9^3 = 2024. - Bruno Berselli, May 12 2014

PROG

(PARI) g(n, p) = for(x=0, n, y=x^2+p; print1(y", "));

(PARI) a(n) = n^2 + 30; \\ Altug Alkan, Apr 30 2018

CROSSREFS

Cf. A007916, A059100, A114949, A241748, A241850.

Sequence in context: A165851 A162503 A003896 * A267747 A022400 A042812

Adjacent sequences:  A114961 A114962 A114963 * A114965 A114966 A114967

KEYWORD

nonn,easy

AUTHOR

Cino Hilliard, Feb 21 2006

EXTENSIONS

New name from Shawn A. Broyles and Altug Alkan, Apr 30 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified May 22 07:38 EDT 2018. Contains 304405 sequences. (Running on oeis4.)