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!)
A161926 Numbers occurring at least twice in A114381, in order of second appearance. 3
991, 104435, 712363, 1932085, 4816631, 2685019, 9180975, 13841797, 27084303, 10089313, 18865937, 72584313, 12235713, 29071365, 59499291, 27454813, 40349105, 18039791, 35811791, 26392813, 62173813, 79465965, 59293917 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Numbers that have three occurrences in A114381 are not known to date.

LINKS

Klaus Brockhaus, Table of n, a(n) for n=1..222.

EXAMPLE

A114381(11) = A114381(14) = 991; A114381(193) = A114381(348) = 104435; A114381(654) = A114381(2364) = 712363.

PROG

(PARI) /* gives terms and index of second occurrence */ {m=100000; S=[]; c=0; for(k=1, m, a=sum(j=prime(k), prime(k+1), prime(j)); S=setunion(S, Set(a)); d=#S; if(c==d, print(a, ", " , k), c=d))}

CROSSREFS

Cf. A114381, A161927 (index of second occurrence).

Sequence in context: A255098 A155509 A093177 * A172698 A109149 A237991

Adjacent sequences:  A161923 A161924 A161925 * A161927 A161928 A161929

KEYWORD

nonn

AUTHOR

Klaus Brockhaus, Jul 01 2009

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 March 6 20:37 EST 2021. Contains 341850 sequences. (Running on oeis4.)