

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
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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



