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!)
A106574 Indices n of perfect squares n^2 which are neither the sum nor the difference of two primes. 2
11, 17, 23, 25, 31, 41, 51, 53, 59, 65, 67, 73, 79, 83, 85, 87, 91, 95, 97, 101, 109, 113, 115, 125, 129, 133, 137, 141, 143, 149, 151, 153, 157, 159, 163, 165, 167, 175, 179, 181, 185, 187, 189, 193, 195, 197, 199, 201, 203, 207, 209, 213, 215, 221, 227, 229 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..56.

FORMULA

a(n) = sqrt(A106573(n)).

EXAMPLE

a(2)=17 because the second square which is nor the sum nor the difference of two primes (289=17^2) is the 17th one in the succession of the perfect squares (thus: index 17).

CROSSREFS

Cf. A106544-A106548, A106562-A106564, A106571, A106573-A106575, A106577.

Sequence in context: A190039 A066074 A106563 * A171125 A156781 A175888

Adjacent sequences:  A106571 A106572 A106573 * A106575 A106576 A106577

KEYWORD

easy,nonn

AUTHOR

Alexandre Wajnberg, May 09 2005

EXTENSIONS

Corrected and extended by Ray Chandler, May 12 2005

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 October 24 18:08 EDT 2021. Contains 348233 sequences. (Running on oeis4.)