A034592 -id:A034592 - cp's OEIS frontend

A034591 Numbers whose concatenation with the next prime yields a prime.

0, 2, 6, 8, 9, 12, 27, 31, 36, 42, 44, 45, 51, 56, 63, 68, 69, 78, 83, 86, 93, 94, 96, 98, 102, 104, 105, 108, 115, 117, 118, 123, 126, 132, 138, 150, 151, 154, 156, 157, 160, 167, 176, 180, 183, 186, 192, 194, 195, 199, 201, 205, 213, 217, 219, 225, 230, 233

Offset: 1

Patrick De Geest, Oct 15 1998

			8 is a term because nextprime(8) = 11 and 811 is prime.

See also A034592, A034593, A034594, A034596, A030459.

Select[Range[0,250],PrimeQ@FromDigits@Flatten[IntegerDigits/@{#,NextPrime@#}]&] (* Giorgos Kalogeropoulos, Jul 30 2021 *)

isok(m) = isprime(eval(Str(m, nextprime(m+1)))); \\ Michel Marcus, Oct 03 2014 and Jul 30 2021

A036339 Concatenation of prime p and nextprime(p) is prime -> cycles of 2 steps possible.

Original entry on oeis.org

467, 941, 13681, 14461, 21787, 22171, 22369, 24049, 24151, 25457, 29333, 37397, 41221, 42467, 43481, 46511, 48023, 54133, 56681, 68699, 75883, 85081, 101341, 103511, 117443, 120193, 126199, 137363, 144323, 145133, 158791, 175853, 181891, 183797

Offset: 1

Patrick De Geest, Dec 15 1998

C. Rivera, Details of procedure

Cf. A030459, A034592, A036340, A036341.

Offset corrected and missing 181891 inserted by Sean A. Irvine, Oct 26 2020

cp's OEIS Frontend

A034591 Numbers whose concatenation with the next prime yields a prime.

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A036339 Concatenation of prime p and nextprime(p) is prime -> cycles of 2 steps possible.

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