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A051217
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Nonnegative numbers of the form 6^x - y^2.
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5
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0, 1, 2, 5, 6, 11, 20, 27, 32, 35, 36, 47, 71, 72, 95, 116, 135, 140, 152, 167, 180, 191, 200, 207, 212, 215, 216, 272, 335, 380, 396, 431, 455, 512, 551, 567, 620, 671, 720, 767, 812, 855, 860, 887, 896, 935, 972, 1007, 1040, 1052, 1071, 1100, 1127, 1152
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| No integers congruent to {3,4,8,9} mod 10. - Moshe Levin, Nov 14 2011.
If n is not in this sequence, then A200440 gives the least modulus which proves that there cannot be a solution to n=6^x-y^2. - M. F. Hasler, Nov 18 2011.
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LINKS
| Hugo Pfoertner, Table of n, a(n) for n = 1..513
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PROG
| (PARI) is_A051217(n) = !A200440(n) \\ - M. F. Hasler, Nov 18 2011
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CROSSREFS
| Cf. A201122.
Sequence in context: A088273 A049054 A135476 * A110975 A190120 A069789
Adjacent sequences: A051214 A051215 A051216 * A051218 A051219 A051220
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KEYWORD
| nonn
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AUTHOR
| David W. Wilson (davidwwilson(AT)comcast.net)
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