A232766 Numbers n such that the concatenation n987654321 is prime.

28, 32, 44, 50, 55, 58, 97, 100, 107, 112, 130, 149, 152, 154, 179, 193, 208, 233, 259, 265, 271, 287, 310, 314, 320, 326, 341, 359, 365, 376, 404, 413, 421, 439, 449, 455, 457, 466, 469, 491, 499, 536, 538, 545, 547, 548, 557, 565, 568, 574, 593, 614, 616

Offset

1,1

Links

Table of n, a(n) for n=1..53.

Example

314 is a member of this sequence because 314987654321 is prime.

Prog

(Python)
from sympy import isprime
{print(n, end=', ') for n in range(2000) if isprime(int(str(n)+"987654321"))}
# Simplified by Derek Orr, Apr 10 2015
(PARI) for(n=1, 2000, if(isprime(eval(concat(Str(n), "987654321"))), print1(n, ", "))) \\ Derek Orr, Apr 10 2015
(Magma) [n: n in [0..1000] | IsPrime(Seqint(Intseq(987654321) cat Intseq(n)))]; // Vincenzo Librandi, Apr 11 2015

Crossrefs

Cf. A232767, A104914, A104915.

Sequence in context: A025367 A121018 A232727 * A230855 A090637 A261113

Adjacent sequences: A232763 A232764 A232765 * A232767 A232768 A232769

Keyword

nonn,base

Author

Derek Orr, Nov 29 2013

Extensions

More terms from Derek Orr, Apr 10 2015

Status

approved