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!)
A004616 Divisible only by primes congruent to 2 mod 5. 4
1, 2, 4, 7, 8, 14, 16, 17, 28, 32, 34, 37, 47, 49, 56, 64, 67, 68, 74, 94, 97, 98, 107, 112, 119, 127, 128, 134, 136, 137, 148, 157, 167, 188, 194, 196, 197, 214, 224, 227, 238, 254, 256, 257, 259, 268, 272, 274 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

MATHEMATICA

ok[1] = True; ok[n_] := And@@ (Mod[#, 5] == 2 &)/@ FactorInteger[n][[All, 1]]; Select[Range[2000], ok] (* Vincenzo Librandi, Aug 11 2012 *)

PROG

(MAGMA) [n: n in [1..300] | forall{d: d in PrimeDivisors(n) | d mod 5 eq 2}]; // Bruno Berselli, Aug 11 2012

CROSSREFS

Sequence in context: A212243 A336463 A306235 * A322386 A309583 A327478

Adjacent sequences:  A004613 A004614 A004615 * A004617 A004618 A004619

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

Offset changed from 0 to 1 by Vincenzo Librandi, Aug 20 2012

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 September 26 16:15 EDT 2021. Contains 347670 sequences. (Running on oeis4.)