A101250 -id:A101250 - cp's OEIS frontend

A101218 Primes that are a concatenation of 2, 3 and a prime.

233, 2311, 2341, 2347, 2371, 2383, 2389, 23131, 23167, 23173, 23197, 23227, 23251, 23269, 23293, 23311, 23431, 23509, 23557, 23563, 23593, 23599, 23677, 23719, 23743, 23761, 23773, 23827, 23857, 23887, 23911, 23929, 23971, 23977, 231019

Offset: 1

Parthasarathy Nambi, Dec 14 2004

			233 is a prime concatenated from the primes 2,3 and 3
2311 is a prime concatenated from the primes 2,3 and 11

Harvey P. Dale, Table of n, a(n) for n = 1..1000
Peter Alfeld The 10,000 smallest prime numbers.

Cf. A100607, A101219, A101249, A101250, A101251, A101252.

Select[23*10^IntegerLength[#]+#&/@Prime[Range[200]],PrimeQ] (* Harvey P. Dale, Jun 09 2013 *)

Extended by Ray Chandler, Dec 22 2004

A101219 Primes that are a concatenation of 3, 5 and a prime.

Original entry on oeis.org

353, 3511, 3517, 3529, 3541, 3547, 3559, 3571, 3583, 35107, 35149, 35227, 35251, 35257, 35281, 35311, 35317, 35353, 35401, 35419, 35449, 35461, 35491, 35509, 35521, 35569, 35593, 35617, 35677, 35797, 35809, 35839, 35863, 35911, 35977

Offset: 1

Parthasarathy Nambi, Dec 14 2004

			3511 is a prime concatenated from the primes 3, 5 and 11.

Harvey P. Dale, Table of n, a(n) for n = 1..1000
Peter Alfeld The 10,000 smallest prime numbers.

Cf. A100607, A101218, A101249, A101250, A101251, A101252.

Select[35*10^IntegerLength[#]+#&/@Prime[Range[200]],PrimeQ] (* Harvey P. Dale, Jan 23 2019 *)

Extended by Ray Chandler, Dec 22 2004

A101249 Primes that are a concatenation of 5, 7 and a prime.

Original entry on oeis.org

577, 5711, 5717, 5737, 5741, 5743, 5779, 5783, 57107, 57131, 57139, 57149, 57163, 57173, 57179, 57191, 57193, 57223, 57241, 57251, 57269, 57271, 57283, 57331, 57347, 57349, 57367, 57373, 57383, 57389, 57397, 57457, 57467, 57487, 57503

Offset: 1

Parthasarathy Nambi, Dec 16 2004

			5711 is a prime concatenated from the primes 5,7 and 11.

Daniel Starodubtsev, Table of n, a(n) for n = 1..10000
Peter Alfeld, The 10,000 smallest prime numbers.

Cf. A100607, A101218, A101219, A101250, A101251, A101252.

Select[ Table[ FromDigits[ Flatten[ IntegerDigits /@ {5, 7, Prime[n]}]], {n, 100}], PrimeQ[ # ] &] (* Robert G. Wilson v, Dec 20 2004 *)

Extended by Ray Chandler and Robert G. Wilson v, Dec 22 2004

A101251 Primes that are a concatenation of 2, 3, 5 and a prime.

Original entry on oeis.org

2357, 23531, 23537, 23561, 23567, 235181, 235199, 235211, 235241, 235307, 235337, 235349, 235397, 235439, 235523, 235541, 235577, 235601, 235607, 235661, 235673, 235751, 235787, 235811, 235877, 235919, 235967, 235997, 2351033, 2351171

Offset: 1

Parthasarathy Nambi, Dec 16 2004

			2357 is a prime of order four since it is concatenated from the primes 2,3,5 and 7.

Daniel Starodubtsev, Table of n, a(n) for n = 1..10000
Peter Alfeld, The 10,000 smallest prime numbers.

Cf. A101218, A101219, A101249, A101250, A101252.

Select[ Table[ FromDigits[ Flatten[ IntegerDigits /@ {2, 3, 5, Prime[n]}]], {n, 200}], PrimeQ[ # ] &] (* Robert G. Wilson v, Dec 20 2004 *)

Extended by Ray Chandler and Robert G. Wilson v, Dec 22 2004

A101252 Primes that are a concatenation of 3, 5, 7 and a prime.

Original entry on oeis.org

35729, 35731, 35747, 35753, 35759, 35771, 35797, 357103, 357107, 357109, 357131, 357139, 357179, 357197, 357199, 357211, 357229, 357239, 357241, 357263, 357271, 357281, 357283, 357293, 357347, 357349, 357353, 357359, 357389, 357421, 357431

Offset: 1

Parthasarathy Nambi, Dec 16 2004

			35729 is member as it is concatenated from the primes 3,5,7 and 29.

Daniel Starodubtsev, Table of n, a(n) for n = 1..10000
Peter Alfeld, The 10,000 smallest prime numbers.

Cf. A101218, A101219, A101249, A101250, A101251.

Select[ Table[ FromDigits[ Flatten[ IntegerDigits /@ {3, 5, 7, Prime[n]}]], {n, 95}], PrimeQ[ # ] &] (* Robert G. Wilson v, Dec 20 2004 *)

Extended by Ray Chandler and Robert G. Wilson v, Dec 22 2004

cp's OEIS Frontend

A101218 Primes that are a concatenation of 2, 3 and a prime.

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A101219 Primes that are a concatenation of 3, 5 and a prime.

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A101249 Primes that are a concatenation of 5, 7 and a prime.

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A101251 Primes that are a concatenation of 2, 3, 5 and a prime.

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Extensions

A101252 Primes that are a concatenation of 3, 5, 7 and a prime.

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Author

Keywords

Examples

Links

Crossrefs

Programs

Mathematica

Extensions