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 A027696 Nonparametric solutions to problem in A027669: n such that for some m, the sum of the first m n-gonal numbers is again an n-gonal number. 1
 3, 4, 6, 8, 10, 11, 14, 17, 30, 41, 43, 50, 60, 88, 145, 276, 322, 374, 823, 1152 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS FORMULA The parametric solution: if n=2 mod 3, the sum of the first (n^2-4*n-2)/3 n-gonal numbers is the ((n^3-6*n^2+3*n+19)/9)-th n-gonal number. CROSSREFS Cf. A027669. Sequence in context: A184398 A024665 A027669 * A027440 A169866 A029902 Adjacent sequences:  A027693 A027694 A027695 * A027697 A027698 A027699 KEYWORD nonn AUTHOR Masanobu Kaneko (mkaneko(AT)math.kyushu-u.ac.jp) EXTENSIONS More terms from Masanobu Kaneko (mkaneko(AT)math.kyushu-u.ac.jp), Jan 05 1998 STATUS approved

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Last modified December 8 12:07 EST 2019. Contains 329862 sequences. (Running on oeis4.)