A018849 Strobogrammatic squares: the same upside down (calculator-style numerals).

0, 1, 121, 6889, 10201, 69169, 1002001, 5221225, 100020001, 109181601, 522808225, 602555209, 10000200001, 62188888129, 1000002000001, 1212225222121, 100000020000001, 10000000200000001, 10022212521222001, 12102202520220121

Offset

1,3

Comments

Subsequence of squares in A018846. - Michel Marcus, Aug 04 2014

Links

Table of n, a(n) for n=1..20.

Prog

(PARI) is_A018846(n, t=Vec("012..59.86"))={ apply(x->t[eval(x)+1], n=Vec(Str(n)))==vecextract(n, "-1..1"); }
lista(nn) = {for(n=0, nn, if (is_A018846(n^2), print1(n^2, ", "))); } \\ Michel Marcus, Aug 04 2014

Crossrefs

Sequence in context: A231649 A212802 A272775 * A011814 A238320 A144766

Adjacent sequences: A018846 A018847 A018848 * A018850 A018851 A018852

Keyword

nonn,base

Author

David W. Wilson

Status

approved