A280357 Primes formed from concatenating nextprime(n) and n.

53, 2927, 3733, 4139, 5347, 5351, 5953, 6761, 6763, 9791, 113111, 127123, 131129, 137131, 149143, 179173, 191189, 211199, 223211, 223217, 223219, 233231, 239233, 239237, 263257, 277273, 281279, 307301, 331319, 347341, 359353, 359357, 419417, 431423, 431429, 479473

Offset

1,1

Comments

Alternatively: Primes formed from reverse concatenation of n and nextprime(n).

Links

K. D. Bajpai, Table of n, a(n) for n = 1..10000

Example

53 is in the sequence because it is prime formed from concatenation of 5 and 3, where 5 is next prime after 3.
3733 is in the sequence because it is prime formed from concatenation of 37 and 33, where 37 is next prime after 33.

Mathematica

Select[Table[FromDigits[Join[IntegerDigits[NextPrime[n]], IntegerDigits[n]]], {n, 1000}], PrimeQ]

Prog

(Magma) [p : n in[1 .. 200] | IsPrime(p) where p is Seqint(Intseq(n) cat Intseq(NextPrime(n)))];

Crossrefs

Cf. A000040, A084667, A084669, A151799, A151800, A280388.

Sequence in context: A059694 A263516 A243231 * A300406 A013542 A200917

Adjacent sequences: A280354 A280355 A280356 * A280358 A280359 A280360

Keyword

nonn,base

Author

K. D. Bajpai, Jan 04 2017

Status

approved