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A171706 The first n-fold intrinsically 7-palindromic number (represented in base 10). 25
65, 186621, 3360633 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Though this sequence is apt to never have many known members, its third is quite a nice coincidence for consideration.

A029965 runs just short of space to show it, and A053780 is a totally unrelated collection of palindromes that also includes 33633 in addition to 3360633.

a(4) > 10^17. - Hiroaki Yamanouchi, Aug 22 2015

LINKS

Table of n, a(n) for n=1..3.

EXAMPLE

a(2)=186621 is 3555553 in base 6 and 1405041 in base 7.

a(3)=3360633 is 6281826 in base 9 and 1995991 in base 11.

CROSSREFS

Cf. A171701, A171702, A171703, A171704, A171705, A171741, A029966, A029965, A053780.

Sequence in context: A242283 A061688 A218689 * A015072 A015039 A238612

Adjacent sequences:  A171703 A171704 A171705 * A171707 A171708 A171709

KEYWORD

more,nonn,bref,base

AUTHOR

James G. Merickel, Dec 16 2009

EXTENSIONS

Typo in third term corrected by James G. Merickel, Dec 18 2009

STATUS

approved

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Last modified December 13 06:26 EST 2019. Contains 329968 sequences. (Running on oeis4.)