A284665 - OEIS

A284665

Numbers of form p^i + p^j for p prime and i, j > 0.

4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 30, 32, 34, 36, 38, 40, 46, 48, 50, 54, 56, 58, 62, 64, 66, 68, 72, 74, 80, 82, 84, 86, 90, 94, 96, 98, 106, 108, 118, 122, 128, 130, 132, 134, 136, 142, 144, 146, 150, 158, 160, 162, 166, 178, 182, 192, 194

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OFFSET

1,1

COMMENTS

All terms are even.

LINKS

Table of n, a(n) for n=1..59.

EXAMPLE

24 = 2^4 + 2^3.

30 = 3^3 + 3^1 = 5^2 + 5^1.

PROG

(PARI) limit=L; v=vector(limit); for(n=1, limit, forprime(p=2, n/2, for(k=1, logint(n\2, 2), for(j=k, logint(n, 2), if(n-p^k==p^j, v[n]=1, ))))); for(n=1, limit, if(v[n], print1(n", ")))

CROSSREFS

Cf. A246655.

Sequence in context: A325038 A360127 A111305 * A210939 A175246 A353537

Adjacent sequences: A284662 A284663 A284664 * A284666 A284667 A284668

KEYWORD

nonn

AUTHOR

Gionata Neri, Mar 31 2017

STATUS

approved