A045574 Numbers that are still numbers when turned upside down (uses only digits 0, 1, 6, 8, 9 with no final 0's).

0, 1, 6, 8, 9, 11, 16, 18, 19, 61, 66, 68, 69, 81, 86, 88, 89, 91, 96, 98, 99, 101, 106, 108, 109, 111, 116, 118, 119, 161, 166, 168, 169, 181, 186, 188, 189, 191, 196, 198, 199, 601, 606, 608, 609, 611, 616, 618, 619, 661, 666, 668, 669, 681, 686, 688, 689, 691, 696, 698, 699

Offset: 1

Author

Erich Friedman

Keywords

• base
• easy
• nonn

Comments

"No final 0's" means that the rotated number should not have leading zeros; the single digit of the number 0 itself is not considered as such.

Links

• Michel Marcus, Table of n, a(n) for n = 1..2501
• Index entries for sequences related to final digits of numbers

Crossrefs

Cf. A000787, A018847, A054047, A057770.

Programs

PARI

is_A045574(n)=n%10 & !setminus(Set(Vec(Str(n))),Vec("01689")) || !n  \\ M. F. Hasler, May 04 2012

Extensions

More terms from Michel Marcus, Dec 27 2020