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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A070884 7 + x where x is congruent to {0, 4, 6, 10, 12, 16, 22, 24} mod 30. 1
7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 49, 53, 59, 61, 67, 71, 73, 77, 79, 83, 89, 91, 97, 101, 103, 107, 109, 113, 119, 121, 127, 131, 133, 137, 139, 143, 149, 151, 157, 161, 163, 167, 169, 173, 179, 181, 187, 191, 193, 197, 199, 203, 209, 211, 217, 221 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Sequence contains many primes.

A007775 without the first term. Strictly speaking, the sequence should include the 1, because 1=7-6 and -6 = 24 mod 30. [From R. J. Mathar, Sep 25 2008]

LINKS

Table of n, a(n) for n=0..57.

Index entries for linear recurrences with constant coefficients, signature (1,0,0,0,0,0,0,1,-1).

FORMULA

G.f.: ( 7+4*x+2*x^2+4*x^3+2*x^4+4*x^5+6*x^6+2*x^7-x^8 ) / ( (1+x)*(x^2+1)*(x^4+1)*(x-1)^2 ). - R. J. Mathar, Sep 22 2016

EXAMPLE

7+0=7, 7+4=11, 7+6=13, 7+10=17, 7+12=19, 7+16=23, ...

PROG

(Perl) $a = 0; while ((($a % 30 == 0 or $a % 30 == 4 or $a % 30 == 6 or $a % 30 == 10 or $a % 30 == 12 or $a % 30 == 16 or $a % 30 == 22 or $a % 30 == 24) and eval("print \"\".(7+\$a).\" \"; return 0; ")) or ++$a) { }

CROSSREFS

Sequence in context: A322272 A161850 A007775 * A135777 A090459 A090417

Adjacent sequences:  A070881 A070882 A070883 * A070885 A070886 A070887

KEYWORD

easy,nonn

AUTHOR

Timothy McAlee Sr., May 24 2002

EXTENSIONS

More terms from Jim McCann (jmccann(AT)umich.edu), Jul 17 2002

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 16 18:53 EDT 2021. Contains 343050 sequences. (Running on oeis4.)