A249834 a(n+1) is the next smallest nontrivial cube beginning with a(n), initial term is 7.

7, 729, 7290099019, 72900990191475181426079596544

Offset

1,1

Comments

a(5) is an 87-digit number. - Jon E. Schoenfield, Dec 04 2014

Links

Jon E. Schoenfield, Table of n, a(n) for n = 1..7

Prog

(Python)
def f(x):
..n = x
..s = 1
..while s < 10**7:
....if s % 10:
......S = str(s**3)
......if S.startswith(str(n)):
........print(s**3, end=', ')
........n = s**3
....s += 1
f(7)
(PARI) a(n)=k=n; s=1; while(s<10^7, if(s%10, if(s^3\(10^(#Str(s^3)-#Str(k)))==k, print1(s^3, ", "); k=s^3)); s++)
a(7)

Crossrefs

Cf. A048559, A048561, A249799, A249897.

Sequence in context: A162138 A067448 A249897 * A064571 A111476 A246107

Adjacent sequences: A249831 A249832 A249833 * A249835 A249836 A249837

Keyword

nonn,base

Author

Derek Orr, Dec 03 2014

Extensions

a(4) from Jon E. Schoenfield, Dec 04 2014

Status

approved