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!)
A126332 Numbers n such that 10n + 13 is prime. 0
0, 1, 3, 4, 6, 7, 9, 10, 15, 16, 18, 21, 22, 25, 27, 28, 30, 34, 36, 37, 42, 43, 45, 49, 51, 55, 58, 60, 63, 64, 66, 67, 72, 73, 76, 81, 84, 85, 87, 94, 97, 100, 102, 105, 108, 109, 111, 114, 115, 118, 120, 121, 127, 129, 136, 141, 142, 144, 147, 148, 151, 153, 154, 157 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Solutions of the equation (10*n + 13)' = 1, where n' is the arithmetic derivative of n. - Paolo P. Lava, Jan 03 2013

LINKS

Table of n, a(n) for n=1..64.

FORMULA

a(k) = A102338(k+1) - 1. - R. J. Mathar, Jul 08 2009

EXAMPLE

If n = 100 then 10*n + 13 = 1013 (prime).

PROG

(MAGMA) [n: n in [0..1000] | IsPrime(10*n + 13)] // Vincenzo Librandi, Nov 23 2010

(PARI) is(n)=isprime(10*n+13) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

Cf. A102342, A126785.

Sequence in context: A190858 A026315 A143264 * A039026 A123540 A065313

Adjacent sequences:  A126329 A126330 A126331 * A126333 A126334 A126335

KEYWORD

nonn,easy

AUTHOR

Parthasarathy Nambi, Mar 10 2007

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 June 2 11:35 EDT 2020. Contains 334771 sequences. (Running on oeis4.)