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

 

Logo
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
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
Sequence in context: A222116 A229107 A109574 * A062352 A033938 A069598
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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 19 20:30 EDT 2024. Contains 372703 sequences. (Running on oeis4.)