A007284 Horizontally symmetric numbers. (Formerly M4477)

0, 1, 3, 8, 10, 11, 13, 18, 30, 31, 33, 38, 80, 81, 83, 88, 100, 101, 103, 108, 110, 111, 113, 118, 130, 131, 133, 138, 180, 181, 183, 188, 300, 301, 303, 308, 310, 311, 313, 318, 330, 331, 333, 338, 380, 381, 383, 388, 800, 801, 803, 808, 810, 811, 813, 818

Offset

0,3

References

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

Indranil Ghosh, Table of n, a(n) for n = 0..50000

Formula

Numbers using only digits 0, 1, 3 and 8.

Prog

(Python)
allowed = ("0", "1", "3", "8")
def a(n):
    return all(x in allowed for x in str(n))
print([i for i in range(50000) if a(i)])
# Indranil Ghosh, Feb 03 2017

Crossrefs

Cf. A046031.

Sequence in context: A127518 A176118 A151693 * A080892 A177091 A347690

Adjacent sequences: A007281 A007282 A007283 * A007285 A007286 A007287

Keyword

nonn,easy,base

Author

N. J. A. Sloane.

Extensions

More terms from Henry Bottomley, Feb 14 2000

Status

approved