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 A018846 Strobogrammatic numbers: numbers that are the same upside down (using calculator-style numerals). 9
 0, 1, 2, 5, 8, 11, 22, 55, 69, 88, 96, 101, 111, 121, 151, 181, 202, 212, 222, 252, 282, 505, 515, 525, 555, 585, 609, 619, 629, 659, 689, 808, 818, 828, 858, 888, 906, 916, 926, 956, 986, 1001, 1111, 1221, 1551, 1691, 1881, 1961, 2002, 2112, 2222, 2552, 2692, 2882 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS A018847 lists primes in this sequence. - M. F. Hasler, May 05 2012 LINKS T. D. Noe, Table of n, a(n) for n=1..1000 PROG (PARI) is_A018846(n, t=Vec("012..59.86"))={ apply(x->t[eval(x)+1], n=Vec(Str(n)))==vecextract(n, "-1..1") } \\ - M. F. Hasler, May 05 2012 CROSSREFS Cf. A053701 (vertically symmetric numbers), A048708. Sequence in context: A154484 A129300 A107679 * A261578 A264613 A285293 Adjacent sequences:  A018843 A018844 A018845 * A018847 A018848 A018849 KEYWORD nonn,base,easy,nice AUTHOR STATUS approved

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Last modified December 15 11:05 EST 2018. Contains 318148 sequences. (Running on oeis4.)