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A147587
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a(n) = 14*n + 7.
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5
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7, 21, 35, 49, 63, 77, 91, 105, 119, 133, 147, 161, 175, 189, 203, 217, 231, 245, 259, 273, 287, 301, 315, 329, 343, 357, 371, 385, 399, 413, 427, 441, 455, 469, 483, 497, 511, 525, 539, 553, 567, 581, 595, 609, 623, 637, 651, 665, 679, 693, 707, 721, 735
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OFFSET
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0,1
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COMMENTS
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a(n+3) = 14*n + 49 is the sum of seven consecutive odd numbers starting with 2*n+1. - Wesley Ivan Hurt, Apr 11 2015
Numbers k such that 3^k + 1 is divisible by 547. - Bruno Berselli, Aug 22 2018
Sum of the numbers from 2*(n-1) to 2*(n+2). - Bruno Berselli, Oct 25 2018
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LINKS
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FORMULA
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a(n) = a(n-1) + 14.
G.f.: 7*(1 + x)/(1 - x)^2.
a(n) = 2*a(n-1) - a(n-2). (End)
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MAPLE
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MATHEMATICA
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PROG
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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