login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A089360 Prime worms. 0
101, 131, 151, 181, 191, 313, 353, 373, 383, 727, 757, 787, 797, 919, 929, 12101, 14741, 18181, 32323, 34543, 35353, 35753, 72727, 74747, 75797, 78787, 79757, 94949, 95959, 97579, 1012321, 1212121, 1414741, 1474141, 1616161, 3131353 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

While some palindromic primes are included, there are other criteria for addition to this sequence.

REFERENCES

Carlos Rivera's primepuzzles.net, Puzzle 246

LINKS

Table of n, a(n) for n=1..36.

Carlos Rivera, Puzzle 246. The worms

FORMULA

From sequence of primes beginning with 3-digits, select those with identical first and last digits; no adjacent digits identical; and absolute value of sequential differences of paired digits a constant.

EXAMPLE

a(15)=12101; first and last digits = 1; no identical adjacent digits; abs(1-2)=1;abs(2-1)=1; abs(1-0)=1; abs(0-1)=1; the worm is 1.

CROSSREFS

Cf. A089291, A089315-89317, A048398-48405.

Sequence in context: A154270 A056730 A077798 * A056728 A085112 A059758

Adjacent sequences:  A089357 A089358 A089359 * A089361 A089362 A089363

KEYWORD

easy,nonn,base

AUTHOR

Enoch Haga, Dec 27 2003

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 22 05:29 EDT 2019. Contains 328315 sequences. (Running on oeis4.)