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A185253(n) is the a(n)-th triangular number.
7

%I #11 Dec 28 2024 22:14:04

%S 3,11,25,20,56,73,51,42,49,183,117,406,532,602,356,325,842,144,164,

%T 900,119,1406,1630,1011,1156,935,2050,2000,2222,2541,1690,2488,1981,

%U 3699,1308,2924,4371,897,311,5113,5735,3783,5549,1807,696,5654,6478

%N A185253(n) is the a(n)-th triangular number.

%C See A185128 for further information.

%D Albert H. Beiler, Recreations in the theory of numbers, New York, Dover, (2nd ed.) 1966, p. 197, no. 8.

%H N. J. A. Sloane, <a href="/A185128/a185128.jpg">Annotated scan of Beiler's Table 81</a>, based on page 197 of Beiler's "Recreations in the Theory of Numbers: The Queen of Mathematics Entertains", New York, Dover, First ed., 1964.

%Y Cf. A000217, A185128, A185129, A185223, A185233, A185243, A185253, A185257.

%K nonn

%O 1,1

%A _Martin Renner_, Jan 20 2012

%E Edited (with a simpler definition) by _N. J. A. Sloane_, Dec 28 2024