A053586 Primes formed by concatenating n consecutive decreasing numbers starting with a prime p(n) and ending with the previous prime p(n-1).

89888786858483, 211210209208207206205204203202201200199, 593592591590589588587, 1327132613251324132313221321, 2377237623752374237323722371, 2963296229612960295929582957

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..3000

Example

89888786858483 belongs to the sequence because it is a prime number obtained by concatenating all the consecutive decreasing numbers from 89 to 83 with the primes 89 and 83.

Mathematica

Select[FromDigits[Flatten[IntegerDigits/@Reverse[Range[#[[1]], #[[2]]]]]]&/@Partition[ Prime[ Range[500]], 2, 1], PrimeQ] (* Harvey P. Dale, May 12 2022 *)

Crossrefs

Cf. A053558.

Sequence in context: A317874 A185432 A288285 * A027605 A259801 A368044

Adjacent sequences: A053583 A053584 A053585 * A053587 A053588 A053589

Keyword

base,nonn

Author

Felice Russo, Jan 19 2000

Status

approved