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A104323 Primes which are the reverse concatenation of four consecutive numbers. 1
10987, 22212019, 86858483, 94939291, 100999897, 106105104103, 112111110109, 122121120119, 124123122121, 146145144143, 184183182181, 226225224223, 232231230229, 244243242241, 274273272271, 332331330329, 362361360359 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
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
KEYWORD
base,nonn
AUTHOR
Shyam Sunder Gupta, Apr 17 2005
STATUS
approved

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Last modified April 20 09:30 EDT 2024. Contains 371799 sequences. (Running on oeis4.)