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A034117
Fractional part of cube root of a(n) starts with digit 1.
1
10, 30, 31, 32, 69, 70, 71, 72, 73, 74, 133, 134, 135, 136, 137, 138, 139, 140, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 358, 359, 360, 361, 362, 363, 364, 365, 366, 367, 368, 369, 370, 371, 372, 373, 532, 533, 534, 535, 536, 537, 538, 539
OFFSET
1,1
PROG
(Python)
from sympy import integer_nthroot
def ok(n): return integer_nthroot(1000*n, 3)[0]%10 == 1
print([k for k in range(540) if ok(k)]) # Michael S. Branicky, Oct 30 2021
CROSSREFS
Cf. A034127.
Sequence in context: A057456 A002422 A031195 * A104863 A362047 A326122
KEYWORD
nonn,easy,base
AUTHOR
Patrick De Geest, Sep 15 1998
STATUS
approved