Location via proxy:   [ UP ]  
[Report a bug]   [Manage cookies]                
The OEIS is supported by the many generous donors to the OEIS Foundation.
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A004087
Primes written backwards.
36
2, 3, 5, 7, 11, 31, 71, 91, 32, 92, 13, 73, 14, 34, 74, 35, 95, 16, 76, 17, 37, 97, 38, 98, 79, 101, 301, 701, 901, 311, 721, 131, 731, 931, 941, 151, 751, 361, 761, 371, 971, 181, 191, 391, 791, 991, 112, 322, 722, 922, 332, 932, 142, 152, 752, 362, 962, 172
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
R. Zumkeller, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = A004086(A000040(n)) = A000040(n) - A068396(n). - N. J. A. Sloane, Jun 29 2008
a(n) = A188649(A000040(n)). - Reinhard Zumkeller, Apr 11 2011
a(n) = A071786(A000040(n)). - Reinhard Zumkeller, Oct 14 2011
MATHEMATICA
FromDigits[Reverse[IntegerDigits[#]]]&/@Prime[Range[100]] (* Vincenzo Librandi, Jul 05 2015 *)
PROG
(Haskell)
a004087 n = a004087_list !! (n-1)
a004087_list = map a004086 a000040_list
-- Reinhard Zumkeller, Oct 14 2011
(Magma) [Seqint(Reverse(Intseq(NthPrime(n)))): n in [1..60]]; // Vincenzo Librandi, Jan 21 2016
(Python)
from sympy import primerange
print([int(str(p)[::-1]) for p in primerange(2, 272)]) # Michael S. Branicky, Jun 24 2022
CROSSREFS
Cf. A000040.
Sequence in context: A101989 A098922 A265324 * A118495 A028906 A118496
Adjacent sequences: A004084 A004085 A004086 * A004088 A004089 A004090
KEYWORD
nonn,base,look
AUTHOR
N. J. A. Sloane
EXTENSIONS
More terms from Eric M. Schmidt, Apr 04 2014
STATUS
approved

Lookup Welcome Wiki Register Music Plot 2 Demos Index WebCam Contribute Format Style Sheet Transforms Superseeker Recents
The OEIS Community
Maintained by The OEIS Foundation Inc.
Last modified March 14 09:34 EDT 2025. Contains 381742 sequences.
License Agreements, Terms of Use, Privacy Policy