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 A280357 Primes formed from concatenating nextprime(n) and n. 2
 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 (list; graph; refs; listen; history; text; internal format)
 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

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Last modified June 10 02:46 EDT 2023. Contains 363183 sequences. (Running on oeis4.)