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A053701
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Vertically symmetric numbers.
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11
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0, 1, 8, 11, 25, 52, 88, 101, 111, 181, 205, 215, 285, 502, 512, 582, 808, 818, 888, 1001, 1111, 1251, 1521, 1881, 2005, 2115, 2255, 2525, 2885, 5002, 5112, 5252, 5522, 5882, 8008, 8118, 8258, 8528, 8888, 10001, 10101, 10801, 11011, 11111, 11811
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| Numbers that are symmetric about a vertical mirror.
2 and 5 are taken as mirror images (as on calculator displays)
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LINKS
| Nathaniel Johnston, Table of n, a(n) for n = 1..2500
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MAPLE
| compdig := proc(n) if(n=2)then return 5: elif(n=5)then return 2: elif(n=0 or n=1 or n=8)then return n: else return -1: fi: end: isA053701 := proc(n) local d, l, j: d:=convert(n, base, 10): l:=nops(d): for j from 1 to ceil(l/2) do if(not d[j]=compdig(d[l-j+1]))then return false: fi: od: return true: end: for n from 0 to 10000 do if(isA053701(n))then printf("%d, ", n): fi: od: # Nathaniel Johnston, May 17 2011
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CROSSREFS
| Cf. A000787, A007284, A018846 (strobogrammatic numbers).
Sequence in context: A000873 A129730 A195160 * A029615 A051791 A160796
Adjacent sequences: A053698 A053699 A053700 * A053702 A053703 A053704
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KEYWORD
| nonn,base
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AUTHOR
| Henry Bottomley (se16(AT)btinternet.com), Feb 14 2000
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EXTENSIONS
| More terms from Larry Reeves (larryr(AT)acm.org), Oct 01 2001
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