A269842 - OEIS

A269842

Integers k such that A000330(k) is the sum of 2 positive cubes.

6, 669, 2456, 5642, 8255, 15855, 50704, 63752, 82621, 112384, 1151884, 1191025, 1203999, 1228825, 1244256, 1459371, 1661343, 1819141, 2264191, 2445632, 2451193, 2812562, 2875250, 3425382, 3792000, 4866303, 5123958, 5587967, 6701643, 6945312, 7726831, 8667249, 10821520

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OFFSET

1,1

COMMENTS

Corresponding square pyramidal numbers are 91, 100029995, 4941161316, 59881606785, 187546467680, 1328674410280, ...

LINKS

Chai Wah Wu, Table of n, a(n) for n = 1..59

EXAMPLE

6 is a term because A000330(6) = 91 = 3^3 + 4^3.

PROG

(PARI) isA003325(n) = for(k=1, sqrtnint(n\2, 3), ispower(n-k^3, 3) && return(1));

for(n=0, 1e7, if(isA003325(n*(n+1)*(2*n+1)/6), print1(n, ", ")));