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A115935 Numbers k such that 2^k contains a pandigital substring. 6
105, 136, 137, 237, 268, 275, 336, 397, 409, 418, 423, 426, 456, 457, 486, 530, 540, 541, 585, 620, 674, 675, 693, 727, 787, 791, 792, 809, 831, 848, 853, 864, 881, 936, 939, 945, 946, 955, 967, 974, 983, 1001, 1011, 1020, 1022, 1024, 1029, 1050, 1064 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Does a(n) ~ n? - David A. Corneth, Feb 28 2021

LINKS

David A. Corneth, Table of n, a(n) for n = 1..10000

David A. Corneth, PARI program

EXAMPLE

2^105 = 40(5648192073)03340847894502572032.

PROG

(PARI) See PARI link \\ David A. Corneth, Feb 28 2021

(Python)

def haspan(s): return any(len(set(s[i:i+10]))==10 for i in range(len(s)-9))

print([m for m in range(1065) if haspan(str(2**m))]) # Michael S. Branicky, Feb 28 2021

CROSSREFS

Cf. A115933, A115934, A115936, A115937, A115938.

Sequence in context: A253022 A267891 A097217 * A069702 A239589 A203614

Adjacent sequences: A115932 A115933 A115934 * A115936 A115937 A115938

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Feb 06 2006

STATUS

approved

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Last modified December 6 10:23 EST 2022. Contains 358630 sequences. (Running on oeis4.)