The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A097928 Numbers in base 10 that are palindromic in bases 3 and 4. 25
 0, 1, 2, 10, 130, 11950, 175850, 749470, 1181729, 11435450, 916821671, 956613659, 1136307905, 46746179770, 77887660577, 635913760790, 53903615484947, 55988454554339, 534479689454189, 1956592840355065 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Intersection of A014190 and A014192. - Michel Marcus, Oct 09 2014 LINKS Ray Chandler, Table of n, a(n) for n = 1..27 (terms < 10^18) Cino Hilliard, util.gp PARI Functions not in the PARI Library. [broken link] Cino Hilliard, Pari Utilities (cached) EXAMPLE 175850 base 10 is 22221012222 base 3 and 175850 base 10 is 222323222 base 4. MATHEMATICA Do[ p3 = IntegerDigits[n, 3]; If[ FromDigits[ Reverse[ p3]] == FromDigits[p3], p4 = IntegerDigits[n, 4]; If[ FromDigits[ Reverse[p4]] == FromDigits[p4], Print[n]]], {n, 2*10^7}] (* Robert G. Wilson v, Sep 07 2004 *) PROG (PARI) palbase(n, b1, b2) = { for(x=1, n, if(ispal(base(10, b1, x))& ispal(base(10, b2, x)), print1(x", ")) ) } \\Requires reading the util.gp file in the link into the gp session. Place in the \.gprc file to automate. CROSSREFS Cf. A014190 (base 3), A014192 (base 4). Sequence in context: A194158 A323715 A111135 * A254431 A011838 A336537 Adjacent sequences:  A097925 A097926 A097927 * A097929 A097930 A097931 KEYWORD base,nonn AUTHOR Cino Hilliard, Sep 04 2004 EXTENSIONS More terms from Robert G. Wilson v, Sep 07 2004 a(11)-a(21) from Donovan Johnson, Apr 23 2010 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.

Last modified December 7 12:17 EST 2021. Contains 349581 sequences. (Running on oeis4.)