The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A244369 Palindromic right-angled primes. 3
 101, 787, 34543, 7654567, 345676543, 34567876543 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Intersection of A002113 and A167842. Intersection of A002385 and A135602. The last term of this sequence is also the last term of A134811. LINKS Table of n, a(n) for n=1..6. EXAMPLE Illustration of a(6) = 34567876543, the last term of this sequence: . . . . . . . . . . . . . . . . 8 . . . . . . . . . 7 . 7 . . . . . . . 6 . . . 6 . . . . . 5 . . . . . 5 . . . 4 . . . . . . . 4 . 3 . . . . . . . . . 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PROG (Python) from sympy import isprime A244369 = [] for n in range(1, 10): ....for m in range(n-1, -1, -1): ........l = ''.join([str(d) for d in range(n, m-1, -1)]) ........p = int(l+l[-2::-1]) ........if isprime(p): ............A244369.append(p) ....for m in range(n+1, 10): ........l = ''.join([str(d) for d in range(n, m+1)]) ........p = int(l+l[-2::-1]) ........if isprime(p): ............A244369.append(p) A244369 = sorted(A244369) # Chai Wah Wu, Aug 15 2014 CROSSREFS Cf. A000040, A002113, A002385, A134811, A135602, A167842. Sequence in context: A171813 A089291 A167842 * A200733 A267002 A242138 Adjacent sequences: A244366 A244367 A244368 * A244370 A244371 A244372 KEYWORD nonn,base,fini,full AUTHOR Omar E. Pol, Jun 26 2014 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 14 05:24 EDT 2024. Contains 375146 sequences. (Running on oeis4.)