OFFSET
1,1
COMMENTS
These are exactly the numbers n such that A010819(n) = 0 mod 13 and 24*n + 11 is squarefree. - Robin Visser, Jul 24 2023
LINKS
Robin Visser, Table of n, a(n) for n = 1..5000
Morris Newman, Further identities and congruences for the coefficients of modular forms [annotated scanned copy], Canadian J. Math 10 (1958): 577-586. See Table 1, column p=5.
PROG
(Sage)
for n in range(1, 1000):
p11 = product([(1 - x^k)^11 for k in range(1, n+1)])
p11n = int(p11.taylor(x, 0, n).coefficients()[n][0])
if (p11n%13 == 0) and (24*n + 11).is_squarefree():
print(n) # Robin Visser, Jul 24 2023
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Oct 04 2015
EXTENSIONS
More terms from Robin Visser, Jul 24 2023
STATUS
approved