The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A084837 Palindromic primes with nonincreasing digits up to the middle and then nondecreasing. 2
 2, 3, 5, 7, 11, 101, 313, 727, 757, 919, 929, 31013, 72227, 73037, 73237, 74047, 75557, 76367, 76667, 77377, 77477, 91019, 93139, 93239, 94049, 94349, 96269, 96469, 97379, 97579, 98389, 98689, 3211123, 3222223, 3310133, 3321233, 3331333, 7100017, 7300037, 7310137 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Michael S. Branicky, Table of n, a(n) for n = 1..10000 Patrick De Geest, World of Palindromic Primes PROG (Python) from sympy import isprime from itertools import count, islice, combinations_with_replacement as mc def agen(): # generator of terms yield from (2, 3, 5, 7, 11) for d in count(2): nind = (int("".join(m+m[:-1][::-1])) for m in mc("9876543210", d)) yield from sorted(filter(isprime, nind)) print(list(islice(agen(), 40))) # Michael S. Branicky, Jun 26 2022 CROSSREFS Cf. A084836, A062351, A062352. Sequence in context: A222116 A229107 A109574 * A062352 A033938 A069598 Adjacent sequences: A084834 A084835 A084836 * A084838 A084839 A084840 KEYWORD nonn,base AUTHOR Patrick De Geest, Jun 07 2003 EXTENSIONS a(38) and beyond from Michael S. Branicky, Jun 26 2022 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 May 19 20:30 EDT 2024. Contains 372703 sequences. (Running on oeis4.)