A104323 Primes which are the reverse concatenation of four consecutive numbers.

10987, 22212019, 86858483, 94939291, 100999897, 106105104103, 112111110109, 122121120119, 124123122121, 146145144143, 184183182181, 226225224223, 232231230229, 244243242241, 274273272271, 332331330329, 362361360359

Offset

1,1

Links

Zak Seidov, Table of n, a(n) for n = 1..328

Example

The first term is 10987 which is a prime and is the reverse concatenation of 7,8,9 and 10 which are four consecutive numbers.

Mathematica

Select[Table[FromDigits[Flatten[IntegerDigits/@Range[n, n-3, -1]]], {n, 4, 400}], PrimeQ] (* Harvey P. Dale, Aug 02 2021 *)

Prog

(PARI) forstep(n=10, 400, 2, isprime(t=eval(Str(n, n-1, n-2, n-3)))&print1(t", ")) \\ Zak Seidov, May 08 2013

Crossrefs

Cf. A052089.

Sequence in context: A270148 A270115 A335082 * A252039 A252033 A352751

Adjacent sequences: A104320 A104321 A104322 * A104324 A104325 A104326

Keyword

base,nonn

Author

Shyam Sunder Gupta, Apr 17 2005

Status

approved