A004087 Primes written backwards.

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

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