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!)
A088629 Smallest number k not included earlier such that the concatenation n, k is a prime. 1

%I

%S 1,3,7,19,9,13,27,11,29,21,17,23,61,33,31,37,41,47,49,39,43,51,57,59,

%T 79,63,53,87,69,67,81,71,73,91,83,77,93,89,103,99,113,97,117,101,119,

%U 133,111,109,121,123,131,127,129,139,147,149,107,151,141,161,153,137,179

%N Smallest number k not included earlier such that the concatenation n, k is a prime.

%C Another rearrangement of odd numbers not == 0 mod 5.

%e a(4) = 19. Though 41, 43 and 47 are prime 1, 3 and 7 have been included earlier and also 49, 411, 413 and 417 are not prime hence 419 is the required prime.

%Y Cf. A088630.

%K base,nonn

%O 1,2

%A _Amarnath Murthy_, Oct 21 2003

%E More terms from _Ray G. Opao_, Aug 19 2004

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 March 30 22:55 EDT 2020. Contains 333132 sequences. (Running on oeis4.)