A171706 The first n-fold intrinsically 7-palindromic number (represented in base 10).

65, 186621, 3360633

Offset: 1

Author

James G. Merickel, Dec 16 2009

Keywords

• more
• nonn
• bref
• base

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

Examples

			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.

Extensions

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