A320865 Powers of 2 with initial digit 9.

9007199254740992, 9223372036854775808, 9444732965739290427392, 9671406556917033397649408, 9903520314283042199192993792, 91343852333181432387730302044767688728495783936, 93536104789177786765035829293842113257979682750464

Offset

1,1

Links

Muniru A Asiru, Table of n, a(n) for n = 1..150

Index to divisibility sequences

Maple

select(x->"9"=""||x[1], [2^n$n=0..200])[];

Mathematica

Select[2^Range[200], IntegerDigits[#][[1]] == 9 &] (* Amiram Eldar, Nov 21 2018 *)

Prog

(GAP) Filtered(List([0..200], n->2^n), i->ListOfDigits(i)[1]=9);
(PARI) select(x->(digits(x)[1]==9), vector(200, n, 2^n)) \\ Michel Marcus, Nov 21 2018

Crossrefs

Cf. A000079 (powers of 2), A008952 (leading digit of 2^n), A217402 (numbers starting with 9).

Powers of 2 with initial digit k, (k = 1..9): A067488, A067480, A320859, A320860, A320861, A320862, A320863, A320864, this sequence.

Sequence in context: A115227 A104836 A247156 * A274810 A329948 A160405

Adjacent sequences: A320862 A320863 A320864 * A320866 A320867 A320868

Keyword

base,nonn

Author

Muniru A Asiru, Nov 21 2018

Status

approved