A180726 -id:A180726 - cp's OEIS frontend

A180706 19^a(n) is smallest power of 19 beginning with n.

0, 5, 2, 6, 17, 3, 14, 7, 25, 18, 11, 29, 4, 40, 15, 8, 26, 44, 1, 37, 55, 12, 30, 5, 23, 41, 59, 16, 77, 34, 52, 9, 27, 45, 106, 2, 20, 142, 38, 56, 117, 13, 31, 92, 49, 110, 6, 24, 85, 207, 42, 225, 60, 17, 78, 200, 35, 157, 53, 175, 10, 132, 28, 89, 150, 46, 107, 3, 64, 186, 21

Offset: 1

Daniel Mondot, Sep 18 2010

D. Mondot, Table of n, a(n) for n=1..32699

Cf. A180704, A180705, A180726

A180728 21^a(n) is smallest power of 21 beginning with n.

Original entry on oeis.org

0, 1, 8, 2, 21, 15, 9, 6, 3, 28, 25, 22, 19, 16, 13, 10, 38, 7, 4, 32, 1, 29, 26, 85, 23, 82, 20, 79, 48, 17, 45, 14, 73, 42, 11, 39, 8, 67, 36, 5, 64, 33, 362, 2, 61, 30, 89, 58, 387, 27, 86, 55, 384, 24, 83, 52, 1191, 21, 80, 1219, 49, 288, 18, 77, 946, 46, 285, 15, 74, 1483, 43

Offset: 1

Daniel Mondot, Sep 18 2010

D. Mondot, Table of n, a(n) for n=1..32699

Cf. A180726, A180727, A180730

Module[{nn=1500,t21},t21=Table[{n,IntegerDigits[21^n]},{n,0,nn}];Table[SelectFirst[ t21,IntegerDigits[k]==Take[#[[2]],IntegerLength[k]]&],{k,80}]][[;;,1]]//Quiet (* Harvey P. Dale, May 14 2023 *)

A180725 Smallest power of 20 that begins with n.

Original entry on oeis.org

1, 20, 3200000, 400, 512000000000, 64000000, 703687441776640000000000000000000000000000000000000000000000, 8000, 900719925474099200000000000000000000000000000000000000000000000000000

Offset: 1

Daniel Mondot, Sep 18 2010

Cf. A009964, A180705, A180726, A180727.

cp's OEIS Frontend

A180706 19^a(n) is smallest power of 19 beginning with n.

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A180728 21^a(n) is smallest power of 21 beginning with n.

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A180725 Smallest power of 20 that begins with n.

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