A340989 The index of A337182 where prime(n) first appears as a factor.

2, 4, 7, 9, 18, 21, 24, 29, 32, 49, 51, 55, 60, 62, 72, 85, 92, 95, 104, 107, 110, 118, 127, 135, 146, 164, 166, 169, 176, 179, 202, 205, 218, 220, 232, 237, 247, 262, 265, 279, 287, 290, 303, 306, 309, 313, 328, 339, 347, 350, 355, 363, 366, 399, 403, 412, 418, 424, 433, 441, 443, 456, 476, 479

Offset

1,1

Comments

a(1) = 2 as A337182(2) = 2 which contains prime(1) = 2 as a factor.

a(2) = 4 as A337182(4) = 6 which contains prime(2) = 3 as a factor.

a(3) = 7 as A337182(7) = 10 which contains prime(3) = 5 as a factor.

a(4) = 9 as A337182(9) = 14 which contains prime(4) = 7 as a factor.

Links

Table of n, a(n) for n=1..64.

Crossrefs

Cf. A337182, A338222, A098550, A336957, A064413, A027746.

Sequence in context: A333317 A153776 A005625 * A067785 A059186 A034702

Adjacent sequences: A340986 A340987 A340988 * A340990 A340991 A340992

Keyword

nonn

Author

Scott R. Shannon, Feb 01 2021

Status

approved