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A075434 Numbers that are not the sum of two perfect powers. 2
1, 3, 4, 6, 7, 11, 14, 15, 19, 21, 22, 23, 27, 30, 38, 39, 42, 46, 47, 49, 51, 55, 56, 60, 62, 66, 67, 69, 70, 71, 75, 77, 78, 79, 83, 84, 86, 87, 88, 92, 93, 94, 95, 99, 102, 103, 105, 107, 110, 111, 112, 114, 115, 118, 119, 120, 121, 123, 124, 131, 135, 138, 139, 140 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

PROG

(PARI) lista(nn) = {vec = vector(nn, i, i); pp = concat(1, select(i->ispower(i) , vec)); sumpp = Set(); for (i = 1, #pp, for (j = 1, #pp, sumpp = Set(concat(sumpp, pp[i]+pp[j])); ); ); for (i = 1, nn, if (! setsearch(sumpp, i), print1(i, ", ")); ); } \\ Michel Marcus, Oct 04 2013

CROSSREFS

Cf. A001597, complement of A070049.

Sequence in context: A202112 A079249 A306678 * A085253 A207525 A240208

Adjacent sequences:  A075431 A075432 A075433 * A075435 A075436 A075437

KEYWORD

easy,nonn

AUTHOR

Zak Seidov, Oct 11 2002

STATUS

approved

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Last modified August 12 05:33 EDT 2020. Contains 336438 sequences. (Running on oeis4.)