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Search: id:A111634
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| 1, 11, 13, 14, 15, 16, 17, 18, 19, 25, 205, 1139, 1149, 1159, 26, 206, 1189, 1199, 1259, 36, 27, 207, 1268, 1269, 1274, 1275, 1276, 28, 208, 1279, 1283, 1284, 1285, 1286, 37, 29, 209, 1291, 1293, 1294, 1295, 1296, 1297, 1298, 1299, 2259, 22059, 2368, 2278
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OFFSET
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1,2
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COMMENT
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A111633: Let n = abc... denote the decimal digits of n. Then a(n) = C(a,z)+C(b,y)+C(c,x)+...+C(x,c)+C(y,b)+C(z,a).
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MATHEMATICA
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f[n_] := Plus @@ Binomial[ IntegerDigits[n], Reverse[ IntegerDigits[ n]]]; Table[ f[n], {n, 0, 100}]; g[n_] := Block[{k = 1}, While[f[k] != n, k++ ]; k]; Table[ g[n], {n, 50}]
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CROSSREFS
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Cf. A111633, A111696.
Adjacent sequences: A111631 A111632 A111633 this_sequence A111635 A111636 A111637
Sequence in context: A128509 A043645 A043700 this_sequence A065877 A129917 A102577
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com) and Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 19 2005
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