login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A160358 Indices of primes in A133547, i.e., numbers n such that the sum of the squares of the first n odd primes is prime. 1
3, 5, 9, 11, 23, 29, 63, 65, 71, 95, 141, 159, 161, 173, 179, 183, 209, 219, 255, 299, 323, 341, 365, 371, 389, 393, 453, 485, 521, 567, 579, 605, 623, 633, 635, 639, 677, 701, 711, 723, 725, 747, 785, 827, 867, 945, 981, 993, 999, 1001, 1013, 1035, 1037, 1041 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
All terms are necessarily odd. Thus one could also consider the sequence floor(a(n)/2) = (1,2,4,5,11,14,31,32,35,...). Other possible variations would be to list the index a(n)+1 of the largest prime in that sum, or, since this is always even, (a(n)+1)/2 = (2,3,5,6,12,15,32,33,36,...).
LINKS
FORMULA
A160359(n) = A133547(a(n)) = A024450(a(n)+1) - 4.
PROG
(PARI) s=0; for( i=2, 1999, isprime(s+=prime(i)^2) & print1(i-1, ", "))
CROSSREFS
Sequence in context: A256220 A163778 A328643 * A319084 A120806 A020946
KEYWORD
nonn
AUTHOR
M. F. Hasler, May 18 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 23 05:35 EST 2024. Contains 370267 sequences. (Running on oeis4.)