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A025722
Index of 7^n within sequence of numbers of form 4^i*7^j.
0
1, 3, 6, 11, 17, 25, 34, 44, 56, 69, 84, 100, 117, 136, 156, 178, 201, 225, 251, 278, 307, 337, 368, 401, 435, 471, 508, 546, 586, 627, 670, 714, 759, 806, 854, 904, 955, 1007, 1061, 1116, 1173, 1231, 1290, 1351, 1413, 1477, 1542, 1608, 1676, 1745, 1816, 1888
OFFSET
1,2
CROSSREFS
Sequence in context: A109413 A294397 A003022 * A022775 A025743 A022338
KEYWORD
nonn
STATUS
approved