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A217394
Numbers starting with 2.
14
2, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242
OFFSET
1,1
The lower and upper asymptotic densities of this sequence are 1/18 and 10/27, respectively. - Amiram Eldar, Feb 27 2021
FORMULA
a(n) = n + (17*10^floor(log_10(9*n-8))-8)/9. - Alan Michael Gómez Calderón, May 15 2023
MATHEMATICA
Select[Range[300], IntegerDigits[#][[1]] == 2 &] (* T. D. Noe, Oct 02 2012 *)
PROG
(Python)
def agen():
yield 2
while True:
for i in range(10**digits): yield adder + i
g = agen()
print([next(g) for i in range(54)]) # Michael S. Branicky, Feb 20 2021
CROSSREFS
Subsequences include: A045708, A045726, A077327, A077678, A106412, A106422.
Sequence in context: A278938 A303157 A338994 * A072998 A024629 A235500
KEYWORD
nonn,base,easy
AUTHOR
Jeremy Gardiner, Oct 02 2012
STATUS
approved

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Last modified September 20 02:41 EDT 2024. Contains 376016 sequences. (Running on oeis4.)