id:A035497 - OEIS Search Results

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Happy primes: primes that eventually reach 1 under iteration of "x -> sum of squares of digits of x".

+0
4

7, 13, 19, 23, 31, 79, 97, 103, 109, 139, 167, 193, 239, 263, 293, 313, 331, 367, 379, 383, 397, 409, 487, 563, 617, 653, 673, 683, 709, 739, 761, 863, 881, 907, 937, 1009, 1033, 1039, 1093, 1151, 1277, 1303, 1373, 1427, 1447, 1481, 1487, 1511, 1607, 1663 (list; graph; listen)

	OFFSET	`1,1`
	REFERENCES	`R. K. Guy, Unsolved Problems Number Theory, Sect. E34.`
	LINKS	`C. Rivera, Related puzzle page` `Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.`
	CROSSREFS	`Cf. A007770, A046519.` `Sequence in context: A049591 A058620 A038910 this_sequence A059335 A070419 A080199` `Adjacent sequences: A035494 A035495 A035496 this_sequence A035498 A035499 A035500`
	KEYWORD	`nonn,easy,base`
	AUTHOR	`njas`
	EXTENSIONS	`More terms from Patrick De Geest (pdg(AT)worldofnumbers.com), Oct 15 1999.`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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