A067504 Powers of 7 with digit sum also a power of 7.

1, 7, 2401, 1977326743

Offset

1,2

Comments

Next terms are 7^4433, 7^30810. - Sascha Kurz, Mar 18 2002

Links

Table of n, a(n) for n=1..4.

Crossrefs

Cf. A067499, A067500, A067501, A067502, A067503.

Subsequence of A000420.

Sequence in context: A013740 A209591 A060759 * A203382 A249352 A264743

Adjacent sequences: A067501 A067502 A067503 * A067505 A067506 A067507

Keyword

base,easy,nonn

Author

Amarnath Murthy, Feb 11 2002

Status

approved